What is the fee to buy a small dog?

It does vary by the specific dog. Some dogs have a zero fee that have been there awhile; while, other breeds that are more popular carry a higher adoption fee. Here is the link, I hope it helps: https://indyhumane.org/adopt/profile/?animalID=41159295&apimode=AdoptableSearch

It varies. But typically they charge $100 for adoption.

Yes normally there is a fee associated with all dogs.