Can I make someone sign a release form before returning property that I purchased from them?

Question Details: I obtained a dog from a breeder with no written contract (only verbal/e-mails). I agreed to pay $750 for dog/papers upon breeding (no specific time of payment; no money paid). The dog exibited behavoir/possible health problems expressed in e-mails to her. The breeder agreed in a text to pick up the dog herself and have seen by vet. Now she is refuseing to pick it up and is demanding I return it to her, blaming me for its condition. Can I force her to pick the dog up herself and sign a form releasing me from any expenses/compensation? Can I refuse to give her the dog if she dosen't sign it?

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