Then, if you have a connection with an animal, then they can potentially be your familiar.
You can't just go to a pet store and pick one out.
Its a pact from BOTH sides, both you and the animal must agree.
If the animal rejects you, they are not your familiar.
They help you in magick and you help them. I repeat, you help them aswell. It isn't you getting both sides of the platter.