Merle chihuahuas. Very interesting stuff.

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Squishy22

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#41
Merles can have brown or blue eyes, even amber depending on the color of merle (like red merle). It just depends on where the merle affects the color, really.

If a dog is black with blue eyes, he could be merle or not. Borders come in merle, but blacks often have blue eyes too. They have brown more often, but blue happens. In shelties, that isn't allowed, so the only dogs you really see with blue eyes are merles. You can probably find more basic information on the color in breeds where it's the norm. Another interesting read is danes and harlequin and merle. It gets even more complicated, lol!
Ok, thats what I thought, but was not sure. Thanks. :)
 

Laurelin

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#42
The link jess posted about cyptic merles answered my question about brown eyes being on a merle dog. I am guessing that cryptic merle is the same as hidden merle.

This is Pebbles dad. He is a 4 pound chihuahua. His eye on white is blue while his eye on black is brown. Obviously something has diluted his right eye, does that mean he is a hidden merle? You can also see white or gray coloring on his face. Doesnt look merle to me but its just something I noticed.

I've ALWAYS wondered if he was a hidden merle or not.

Any opinions??

He could be. I would bet not. It's not uncommon for dogs with white around their eyes to have blue eyes either, regardless of whether they are merle or not. Did he have any merle pups? That's a usual teller.

If you look here, there are some non-merles with one or two blue eyes.

http://www.gis.net/~shepdog/BC_Museum/Permanent/BCColors_Eyes/BC_ColorEyeColor.html
 
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Squishy22

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#43
I know this site is about aussies but Im assuming it can mean the same for any breed (its a really neat site about colors and I love looking at it but anyhoo lol
Thats the problem. I've been looking for info on merle chis... not merle aussies. And it seems like there is MUCH MORE info on merle aussies. lol.

Blue eyes is a serious fault in the chihuahua breed standard, and thats part of the reason why I thought that blue eyes would probably mean the dog is a merle.
 
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Squishy22

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#44
He could be. I would bet not. It's not uncommon for dogs with white around their eyes to have blue eyes either, regardless of whether they are merle or not. Did he have any merle pups? That's a usual teller.

If you look here, there are some non-merles with one or two blue eyes.

http://www.gis.net/~shepdog/BC_Museum/Permanent/BCColors_Eyes/BC_ColorEyeColor.html
In pebbles litter there were no merles. Her mom was black and tan. Half of the litter was chocolate and half was black.
 

Laurelin

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#45
Thats the problem. I've been looking for info on merle chis... not merle aussies. And it seems like there is MUCH MORE info on merle aussies. lol.

Blue eyes is a serious fault in the chihuahua breed standard, and thats part of the reason why I thought that blue eyes would probably mean the dog is a merle.
Merle works the same in every breed though. Even in breeds where blue eyes are a fault they happen. I would think if it were that uncommon it would be a DQ, not a fault. It could mean merle, but it could just be a random thing because of the white on that side of the face.
 
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Squishy22

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#46
Merle works the same in every breed though. Even in breeds where blue eyes are a fault they happen. I would think if it were that uncommon it would be a DQ, not a fault. It could mean merle, but it could just be a random thing because of the white on that side of the face.
Ok, thats probably the case. I dont understand why blue eyes is a serious fault, but yet blue merle dogs are accepted. I would think a blue merle with blue eyes would be disqualified in the show ring, but they are not as far as I can tell. Maybe I'm wrong....
 
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#47
Ok, thats probably the case. I dont understand why blue eyes is a serious fault, but yet blue merle dogs are accepted. I would think a blue merle with blue eyes would be disqualified in the show ring, but they are not as far as I can tell. Maybe I'm wrong....
Well in the FCI standar the only thing I could find is

FCI standar said:
Eyes : Large, roundish in shape, very expressive, not protruding, perfectly dark. Light eyes permissible, but not desired.
the AKC has this:

AKC standar said:
Eyes - Full, round, but not protruding, balanced, set well apart-luminous dark or luminous ruby. Light eyes in blond or white-colored dogs permissible. Blue eyes or a difference in the color of the iris in the two eyes, or two different colors within one iris should be considered a serious fault.
So they are faults but not DQ
 

Laurelin

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#48
Ok, thats probably the case. I dont understand why blue eyes is a serious fault, but yet blue merle dogs are accepted. I would think a blue merle with blue eyes would be disqualified in the show ring, but they are not as far as I can tell. Maybe I'm wrong....
From reading the standard for chihuahuas, it seems blue eyes period are a fault, not a DQ, no matter the color. It doesn't say anything about merle when talking about eye color.

For example, eyes in shelties (sorry to use this breed all the time, but it's a breed I'm much more familiar with):

Eyes medium size with dark, almond-shaped rims, set somewhat obliquely in skull. Color must be dark, with blue or merle eyes permissible in blue merles only. Faults-- Light, round, large or too small. Prominent haws.
Merle is confusing though. This dog is actually merle too, but as an adult it's almost impossible to tell. It's easy to see how some people not so educated on the color could cross to a seemingly 'normal' dog and end up with double merles.


He is stunning, imo.
 
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Squishy22

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#49
From reading the standard for chihuahuas, it seems blue eyes period are a fault, not a DQ, no matter the color. It doesn't say anything about merle when talking about eye color.

For example, eyes in shelties (sorry to use this breed all the time, but it's a breed I'm much more familiar with):



Merle is confusing though. This dog is actually merle too, but as an adult it's almost impossible to tell. It's easy to see how some people not so educated on the color could cross to a seemingly 'normal' dog and end up with double merles.


He is stunning, imo.
He doesn't look merle at all! I can definitely see how those accidents can happen. Its scary. Gorgeous dog.
 

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#50
Here is my cousin's merle chi, Roxy, and her brother Moto. Roxy has two brown eyes.

I am in love with Roxy's temperament. She is so fabulous and laid back, confident, and marvelous with children and other dogs. Before I met her I had no idea it was possible for a chi to be like that. And her brother Moto is awesome too. Instead of laid back, he has a 'tude, but it's a good 'tude. :)



Neither one of them is oversized, they are both pretty average within the standard though Moto has better conformation. Roxy is a little bigger boned.

One thing I have never understood was making a color DQ in the standard because of suspected origins. DQing the color doesn't stop dogs from suspected origins of being bred and registered. Just look at Roxy and Moto. If merle was a DQ in chis then Roxy would be DQ'd, but Moto who is within standard could be bred. Which would mean that Moto, who is just as much suspected to be an outcross with another breed as Roxy is, would be polluting the purebred chi genepool even further.
 

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#51
I'm lovin' this thread....and learning things that never crossed my mind....about merles. They do look very cool. I just about lost it looking at those tiny pups on that 2nd website. OMG! I am NOT getting another dog. I am NOT getting another dog. But that can sure give one serious Chi-itis! LOL.

Roxy and Moto are soooooo cute. I love Roxy's coloring. They both sound so nice....like Chulita and Jose`. They have super temperaments, although from a byb. Poor Jose` has bad patellas. But not Chuli. She's just tough as nails. And they're both from the same breeder, completely different litters though.

But I love looking at more correct types...those stockier legs like they're suppose to have. It would be very nice to be able to get a merle but be sure about the absense of those genetic problems that are linked to that color. Well, next time....if I ever get another, I'll probably get a rescue anyhow. But that won't be till these guys are gone. But have decided to stick with tiny dogs. They've just got so much going for them.
 

jess2416

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#53
what is REALLY interesting is the merle gene in the Catahoula

The merle gene is the reason for the colorful coat worn by the Catahoula. This coloration is due to a mutation in the merle gene that causes dilution of the solid colors and creates a combination of hues within a color. It is this same gene acting in the Australian Shepherd, Collie, Great Dane, Beauceron, Shetland Sheepdog, Dachshund, and other breeds that display the mottled coat.

For many years the Catahoula has been grouped with these breeds, and it was believed that the gene acted the same in all breeds. A recent DNA study performed at Texas A&M by Leigh Anne Clark, Ph.D., suggests that there may be a modifier gene having an effect on the merle gene within the Catahoula. This study has shown that there are more merle and double merle Catahoulas being used in breeding programs than originally believed. There are many colored dogs with normal hearing that have been tested and shown to be double merles. All of the dogs in the Texas A&M study were BAER tested, and many of those tested were double merles.

The tests which were performed at Texas A&M have given way to the hypothesis that there is a tremendous amount of the phantom merle allele running around in the Catahoula. The study has shown that there are more merle and double merle Catahoulas being bred than non-merles. A large majority of dogs that are phenotypically identified as solid-colored Catahoulas may actually be merles. This is known as Ghost merle or Phantom merle, and cannot be detected without DNA testing. The breeding of a solid-colored dog to a merle dog may appear to be a safe method of breeding; however, not knowing for certain that the solid colored dog is actually a non-merle, can result in the breeding of merle to merle. Knowing if a dog is non-merle, merle, or double merle can only be proven via DNA tests.

The double merle, which has in the past been phenotypically identified by many as a white dog, may actually have a full colored coat in the Catahoula. This proves that phenotype cannot be used to identify a double merle. The only means of identification is via DNA testing which is currently being offered by GenMark, of Vita-Tech Laboratories.

It has long been thought that the double merle was the cause of the deafness in the Catahoula; however, a Double Merle Male was bred to a Double Merle Female, and produced a complete litter of Double Merle puppies. The result was a litter of pups that were fully colored and without deafness. This gives way to the thought that there is something having a positive effect on a double merle breeding in Catahoulas that is not present in other merle breeds. Could it be that the feared double merle is not as dangerous in the Catahoula as it is for other breeds?

I have been breeding dogs for over 25 years, and since 1994 have been breeding merle to merle as a part of my breeding program. The manner in which I began this program was to study the Sire and Dam, and the litters in which they belonged. I would also study the Grand Sire and Grand Dam and the litters in which they belonged. I found that identifying coat and eye coloration, as well as the problems any of the pups may have had, gave me a better idea of what may be produced when a pair was bred.

Anyone from whom I've purchased a dog can attest to the questions about lineage and litters. I've asked some questions that some breeders would be very reluctant to answer. I've been sworn to secrecy on some of those answers and they will remain with me forever, but, if those questions were not asked and answered, I would not have been able to achieve the results that I have.

Keeping records of the breeding and the litters aided in what was working well, and what was not working. By studying those results, it presented a picture of which dogs could or should be bred together. Knowing which dogs to breed resulted in reducing the deafness problem which plagues many kennels. When I first started the merle to merle program, my deafness ratio was about 25 percent, and still well below the average. Today, it is about 9 percent. It has been reduced by more than half, simply by studying the litters instead of just choosing a male or female to breed based solely on color.

There are many breeders that will tell you to keep away from breeding white dogs, but will purposefully breed for white collars, blazed faces, and white feet. In most breeds, this combination is commonly known as Irish Spotting. Irish Spotting is a division of the Piebald gene, and many dogs that have been identified as double merles have a pattern similar to Irish Spotting, either appearing in the feet, neck, or face. The Piebald gene regulates the merle gene - so while they are related, this does not mean that Catahoulas actually have the piebald mutation. In fact, it probably shows why the merle gene can cause a pattern that looks like piebald. There is no way to prove this until a test for piebald is available. Could it be that breeding for "Irish Spotting" in merle dogs is adding to the deafness problem in the Catahoula?

When I wrote my book, I stated that when breeding Catahoulas (merle) light to light should be avoided. Dark to light, medium to light, medium to medium and dark to dark in merle dogs should produce the better results. Well, after all the testing that has been performed, and a breeding program culminating 12 years, that statement still holds true. If any breeding of light colored, or white, Catahoulas is to be performed, it should be done with a dark merle or non-merle dog coming from a litter of pups that were medium to dark in color.

Now that DNA testing can identify merle and non-merle, it is beneficial to the breeder to have their dogs DNA tested. Knowing that you are about to breed a light colored double merle to a non-merle, which will produce a complete litter of single merle pups means less chance of defective pups being born. Today's breeder has more tools at their disposal than ever before, and those that refuse to use the tools will only be hurting the breed as a whole.
 

Laurelin

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#54
For many years the Catahoula has been grouped with these breeds, and it was believed that the gene acted the same in all breeds. A recent DNA study performed at Texas A&M by Leigh Anne Clark, Ph.D., suggests that there may be a modifier gene having an effect on the merle gene within the Catahoula. This study has shown that there are more merle and double merle Catahoulas being used in breeding programs than originally believed. There are many colored dogs with normal hearing that have been tested and shown to be double merles. All of the dogs in the Texas A&M study were BAER tested, and many of those tested were double merles.
Whoop!

That is interesting. I have heard a similar thing said by some Koolie breeders too. A&M has done a lot of studies with merle.

http://www.cvm.tamu.edu/cgr/merle.htm
 

jess2416

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In 2006 the Texas A&M University discovered a mutation in the dog SILV gene and found it to be responsible for the merle coat colour patterning in dogs. There is now a DNA test that can be performed to verify if a dog is a solid, a single merle, or a double merle. Sometimes the results have been surprising! There seems to be more solid appearing Catahoulas that are actually carrying the merle gene then once was thought. And more dark colored leopards with virtually no white that are actually carrying two merle genes. This would account for “surprises†with resulting pups in litters.
http://www.vita-tech.com/docs/disea...ene_Mar06.pdf#search="DNA testing merle gene"

^^ found that on another website.. (forgot which one it was though) lol
 

jess2416

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#57
The one I linked, maybe? It links to the paper and the studies TAMU has done here with the SILV gene.
no it was on another houla site... and I was trying to post it right when you posted yours lol
 
S

Squishy22

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#58
I'm lovin' this thread....and learning things that never crossed my mind....about merles. They do look very cool. I just about lost it looking at those tiny pups on that 2nd website. OMG! I am NOT getting another dog. I am NOT getting another dog. But that can sure give one serious Chi-itis! LOL.

Roxy and Moto are soooooo cute. I love Roxy's coloring. They both sound so nice....like Chulita and Jose`. They have super temperaments, although from a byb. Poor Jose` has bad patellas. But not Chuli. She's just tough as nails. And they're both from the same breeder, completely different litters though.

But I love looking at more correct types...those stockier legs like they're suppose to have. It would be very nice to be able to get a merle but be sure about the absense of those genetic problems that are linked to that color. Well, next time....if I ever get another, I'll probably get a rescue anyhow. But that won't be till these guys are gone. But have decided to stick with tiny dogs. They've just got so much going for them.
Once you go chihuahua you never go back! ;):D

I've had several large dog breeds.... GSD, husky/chow, rottie, and APBT. But when it comes to small toy breeds, I'm sticking with the chihuahua. Just something about them.
 

Laurelin

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#59
Once you go chihuahua you never go back! ;):D
Haha, I think every breed or breeder has a saying about that with their breed! The papillon people often say that 'They're potato chip dogs, and you can't have just one!' And..... Every pap person I know has more than one or is either looking at getting a second. I've also heard it used for greyhounds and it seems like a true saying for greys too.
 
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Squishy22

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#60
Haha, I think every breed or breeder has a saying about that with their breed! The papillon people often say that 'They're potato chip dogs, and you can't have just one!' And..... Every pap person I know has more than one or is either looking at getting a second. I've also heard it used for greyhounds and it seems like a true saying for greys too.
lol. Yeah, it goes for any breed someone falls in love with. I'd love have another chihuahua some day.
 

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