[SoCalyorkiLvr]

Okay, here is a good analogy, I hope.

What if soneone were "giving you a car for free"? Would you expect a warranty?

I know this is a puppy and not a car and we get emotionally attached to a puppy, but I don't think you can expect her to give you a puppy with a health guaratee which would obligate her to replace the puppy if it had something seriously wrong with it or died when you are not paying her for it.

I think you are lucky to be getting the puppy for free, or in exchange for a future pick of the litter! I would put it all down in writing in a simple format to cover as many contingencies and possiblies as you can come up with. Just state that if the puppy dies or is not suitable for breeding for any reason, you are no longer obligated to give her a puppy from a litter. She may want something else in that case, like a small amount of money for the pet she provided you.

A contract or agreement to be legal requires that both parties get what they bargained for. Just like it wouldn't be fair to hold you to giving her a puppy from a future litter if the puppy ends up unbreedable, it also wouldn't be fair for her to receive no compensation at all for the training, advice, mentoring and free dog. It must be an agreement fair to all parties.