Establish the primary owner of the pet, with the other party transferring all ownership interest to the designated primary owner. Previous Owner's Information.A dog or puppy bill of sale is used to record the legal transfer of a dog from one individual (the "Seller") to another (the "Buyer") for cash or trade. The parties are not relying on any prior communication of any kind. Puppy Contract Step 1 of 7 THIS AGREEMENT IS BETWEEN THE FOLLOWING PARTIES: Seller: Address Line 1 Address Line 2 City Please fill in the information below as complete as possible. The Pet Custody Agreement is a legally binding contract between the co-owners of one or more pets. Edit, sign, and share puppy contract of sale online. No need to install software, just go to DocHub, and sign up instantly and for free.