My top 3 pets would be as follows:

1. The golden goose that lays golden eggs would be my choice of pets, purely for profit of course. Ive never been big on poultry, but for this I would make an exception.

2. A mermaid. If you have to look after a pet, you may as well get a attractive one.

3. A park full of dinasaurs. Hopefully with a lot better security than the jurasic park movies.