RE: What if your pet grows and grows and grows ...
When in Florida, at the wildlife compound we had lots of baby cougars and lepoards, and once a baby tiger. My father-inlaw raised these animals for breeders and once in a while someone would manage to get a permit to buy a baby cougar as a pet. I was always amazed on how people would treat wild animals like domestic ones.
They let them run through their house, and play with their little children, and even slept with them. And there were people who got badly hurt from these (pet) animals.
A bite from a wild animal is much more dangerous than from a domestic pet. For their mouths contain bad germs from their diet, which is raw meat. So when bitten these germs get into the bite and can cause very bad infections and illness.
I know of one man who went in his female cougars cage (who was in heat), then went right into the males cage and got severely bitten on the leg.
He told the hospital it was a dog bite, because he did not want to lose his pets. And when a bad illness and infection set in, and the doctor's were puzzled. He told the truth and that saved his life.
Some animals do not make good pets because of size and strength, and natural behavior.
That pig is domestic, but he looks to be way to big to have in the house. Too big to sleep with on the sofa.