Breeders: How would you feel if a puppy buyer did this?

Idk why it matters how others would feel. Do you not know how to feel? This is a learning experience. What you should have learned by this: Minors cannot enter into an agreement. Never listen to your mom about business matters. Always use a contract. Obviously your relationship with your mom is important, so let this slide and take it for what it is-- a very expensive and important set of lessons.