I don't think I could possibly add any more to this thread than what has already been said.
I'm sure your maltipoo puppy is a sweet, adorable, darling little dog worthy of all the love and attention you are able to provide.
HOWEVER:
-There is no way to perform the really necessary health screenings that are performed on purebred maltese and poodle breeds BEFORE the mating, as there is no way a person can decipher what the outcome will be in terms of producing mixed-breed puppies. So, there's the first problem.
-Second problem, is that this breeder is breeding for profit...most "breeders" who produce mixed breed puppies (and even so many who are producing purebreds) ARE producing puppies, so that they fatten their pockets. Can you imagine paying between $400-$1500 for a MUTT? To me, that's deceptive, and absolutely ridiculous. A REPUTABLE breeder will sometimes break even, and the amount the pet quality puppies are sold for is barely enough to cover the expense of whelping supplies, the health screenings, etc. In fact, most reputable breeders SPEND more in the name of improving their breed than they do MAKING money from it. If you want a mutt or a mixed-breed, head on over to your shelter, interact with the SEVERAL that are already there, and pay the modest adoption fee for the mutt of your dreams...it really just makes more sense. On that same note, there are PLENTY of purebred dogs and puppies that end up in shelters every day as well...there again, modest adoption fee.
-Reputable breeders are true fanciers and experts in their chosen breed, and their true expertise is in the breed standard, in their dog's bloodlines/pedigree, their dog's occupation (if it's a working dog), conformation, temperament, performance in the show ring, or in various other performance events, such as agility trials. When they do plan a mating between champions, there's a lot of work and tedious research gone into selecting the sire and dam, as the ultimate objective is to produce puppies that will also be proven champions who are actually BETTER than the parent animals in the chosen breed. Perhaps they'll breed only once every couple of years, or every four years...it's more about recognizing an OPPORTUNITY to better the breed. And trust me, that doesn't happen on every heat cycle a bitch has during the year...BYB's don't seem to grasp this concept. Their motto tends to be, if the bitch is in heat, by God, you breed her!!! There's money to be made on those pups!
These are just a FEW of the differences between a BYB and a reputable breeder...
That's not to say that we are all going to tell you that because your dog is a mixed breed, that it's some kind of worthless piece of crap, or that you're a wicked evil person for acquiring your dog from a BYB. I just think you, like so many people, lack education on the issues of responsible breeding...a lot more people have increased their awareness on the evils of larger operations such as puppy mills, but are still not recognizing the puppy miller's elusive partner...the BYB.
Enjoy your dog, don't breed him, and have him neutered. He'll bring you a lot of joy as an altered companion, and all of the other mixed breeds waiting in shelters across the country are saying "thank you" for not producing their future roommates.