My sold puppy is suddenly sick

Questioner

I had a litter of pocket bullies Now it turns out that a puppy is suddenly sick and actually has something wrong with her uterus and may need surgery. The buyer contacted me and I immediately told her that she could return the puppy so that she could get her money back, to which she said no, we love the puppy, we are keeping her. But she has been to an animal specialist in Amsterdam, had a laparoscopic operation and a scan, the total picture so far has cost 1200 euros and I haven't even mentioned the operation that still has to come. She also says that we don't have to worry about them costing us money and suddenly she asks for 1000 euros in compensation. Am I obligated to pay that? P.s. we do not have a purchase contract and we are not breeders

Lawyer

No. In principle you sold a puppy with a defect and then according to the rules of consumer law that also apply to private purchases and sales, you did what you had to do, namely offer another puppy. Because people are then attached I understand that this is difficult, what remains is replacement compensation. That is the value of the puppy.