Michael Crichton, the author of Jurassic park, has written another novel about genetics gone all wrong titled "Next". It postulates what genetic engineering might hold for our immediate future.
The concept of perma puppies is mentioned in a discussion of the book, and the mixing of human and animal genes, and all sorts of other brave new notions, some good, some frightening. Imagine a dog that is always a puppy, and lives to be 75 years old, like it's owner.
Hell, if they can do that with a dog, they'll do it with a human and make perma teens, who wouldn't want to be a perma teen? Although being a perma teen wouldn't be your decision, but your parent's. What if your parents decided that you'd be a perma-child?
I've always wanted a tiny full grown giraffe or elephant roaming my back yard.
http://www.amazon.com/Next-Michael-Crichton/dp/0060872985