HI I have a little yorkie Hailey she is 6months,I saved her from a breeder she dragged her back legs,i got her at 3 months I took her to a surgeon who thought it was her spine,after that visit she started getting up on all four legs,so i decided to take her to therapy i had her xrayed and there was no sign of problems,The vet noticed she had tight mussels from dragging her legs so we did laser and swimming which helpped she stiil has a funny walk but has no problem getting around i find her knees seem large,maybe you should try some therapy.i call hailey my little miracle because she probably would have been put down, now she running aroun d
good luck