ok, you have a sentimental attachment for dogs and cats as you consider them as pets. How about fishes?

Two points to be considered for fishes:
1) They are not bred. Fishes (or many other sea food) caught in sea just happen to be there on their own
2) Fishes are common as pets. Aquariums, fish tanks or jars are also part of civilized world. Maybe not the exact species, but enough for the sake of sentimental association.