ok im new here but i HAVE to comment on this thread, i have 2 chihuahuas and have owned minpins in the past.
first off, that comment "get a backyard bred minpin and see for yourself"
if your looking to buy a puppy NEVER get a backyard bred puppy, backyard breeders are usually in it for the money are well known for breeding subpar and non standard dogs and the parents personalities are often questionable...with ANY breed your looking into, REASERCH, always buy from a respectable breeder who reaserches their lines well, preferably one who is involved in showing or agility.
ANY dog can have bad potty habits if its not well trained! not just backyard bred dogs...
that being said.
you state your looking for a jogging companion, for that id usually suggest going a little larger than a toy breed, while these dogs have plenty of energy to spare, jogging isnt realy a known pastime of theirs (theyd much rather have you pick them up when their litle legs get tired lol.) good jogging partners in the relativly small end of medium sized dogs would be spaniels...being a hunting breed they have quite a good amount of energy for pacing themselves in jogging.
however if you have your heart set on a toy breed, jogging wise id probably go with a min pin. however if you like the look of minpins another breed to look at would be the manchester terrier, both these breeds have a little more energy than the chihuhua due to their origional hunting purposes (ratters) whereas chis have been bred to be companions and lapdogs. i have never met a minpin or manchester who was DIRTY, every minpin ive ever met or heard about has been easier to housebreak than any chi ive met (and my grandfather and i breed chis) minpins tend to have more prey drive than chis, and are usually more than happy to accompany you on a longer walk or jog, whereas a chi will be more likely to start pawing at your leg to pick them up half way through the run. however due to this natural prey drive animals like pet mice, rats, hamsters ect should be kept away from them...
chis are happy with the little excersize they can get in the house, they do love a walk or a romp outside and some make good agility dogs, but most prefer to just run around the house and snuggle on your lap
the housebreaking thing, as i said, ive always found minpins easier to housebreak than the chis.
attitude wise, both are big dogs in little bodies and have a terrier like tenacity, both can be highstrung and agressive if not properly trained and socialized, and from a good breeder, however chis tend to be more stubborn than pins, chis also tend to bond extreemly to one person and prefer the company of their own breed, whereas pins tend to be more people social and so long as socilized and spayed/neutered dog social than most chis.
chis are more prone to seperation anxiety than pins.
both are redily trained and very good little dogs, but i think for a more active lifestyle the pin would fit better! ust make sure to get from a responsible breeder and attend some obedience classes (this goes for ANY breed)
as with ANY toy breed, avoid ANY breeder who claims "toy" "teacup" "Mini" "micro" and "rare" in their advertising, as these are all just jazz words used by mills petstores and byb's to ask a higher price for their puppies...that "teacup" puppy is just the runt of the litter and usually has health problems... that "rare colour" is just a colour that shouldnt be part of the breed (NOTE: chihuahuas come in every colour of the rainbow...NO colour is rare in chihuahuas no matter what they say)
minpins also tend to shed less than shorthaired chihuhuas and a little more than longhaired chihuahuas.
hope you find your jogging partner!
They're amazing dogs with strong personalities that need a good, responsible owner to bring out the best in them. I hate seeing "mean" Chihuahua's, they're almost always the owners fault and give Chi's a bad name. 
