Even in the money is all sent at once I completely agree with this. Part of the payment is always considered non-refundable in the case of buyer's remorse or some other unforeseen circumstance, just to prevent seller's from wasting their time and holding an animal for nothing. In this case however I don't think a deposit applies, the animal was misrepresented in my opinion.
I disagree based on the ad. However, during the discussion, clarity through repetition would have helped both parties out (a lot).
