Not necessarily, they were simply one of the earliest domesticated animal, and to become much more.....suitable, for humans homes, they bred them to satisfy different tastes.
This is true with Betta splendens, also known as Siamese Fighting fish or Betta. The males have been bred through countless generations, to have the flowing tails. The tails serve no purpose in the wild, it would actually get them killed, as they are slow and heavy, while being pretty. Should we tamper with mother nature? I don't know, you decide, we have all enjoyed seeing or keeping the fancy goldfish, a round belly and funny swimming behavior, appealing to many. But they are also a product of artificial selection, and they tend to suffer many more diseases and ailments compared to the much more original and ancestrally in-tact carp. Blood parrot cichlids, Flowerhorn cichlids, both do not occur in the wild, the blood parrot being an genetic anomaly, the flowerhorn being a cross breed (which two cichlids it is the result of, is beyond me.)
I'm sure there are reptiles that have been adjusted to suit humans needs more, I simply cannot remember them, not as well as I used to at the least.
The only difference between the animal and the human, are the letters that they are spelled with.