Rupa From Bangalore want legal help in Others

I have given my pup for adoption, but we have not signed any documents. I still have my pup’s documents such as vaccination book and medical documents of the vet. As I am feeling let down and depressed after giving him, I went back and asked the adopters to give him back, but they refused. Now how can I get him back. I am not happy with his living conditions at the adopter ‘s house. So I asked them to give him back for which they refused.