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Hi and welcome.
You can bind the buyer but you cannot bind 3rd persons forcing them to sign the contract. You could sue to force the buyer to perform the contract because the puppy is unique. You would have to get personal jurisdiction over the buyer....not an issue if she lives in your state. If she lives out of state, you may be able to sue in your state and serve her in her state if the sale took place in your state. You would need to sue for a judgment declaring the contract valid.
You cannot control what your buyers do legally..it is not practical and clauses cannot be enforced. You don't have the legal right to sue for any amount because of what they did with the dog. sorry
Rich dog lover - king charles spaniel "Pebbles" :-)