Hi we have just taken on a 9 week old pup from an owner who was struggling to care for them properly. This was probably a stupid thing to do but heart ruled head. Anyway she is beautiful and lively but very skinny. He could only afford really cheap adult food. We have put her onto puppy food and have suddenly noticed (3 days later) that one of her legs is buckling over. Is this our fault for giving her puppy food? Any advice on what to do to rectify this? She is going to vets on Thursday but any advice from experienced whippet lovers welcome !