So I have a Shi Tzu and Maltese mix. He's 5 or 6 years old. He was always a very active dog. Playing in the backyard, playing with the other dog, jumping on and off bed, couches, etc. A few days ago he started favoriting his right hind leg. The next day he seemed a bit more mobile but still favored his right hind leg. Today he laid in bed for hours and finally I discovered he could hardly stand on his hind legs at all. I took him to the vet and they diagnosed him with degenerative back disease. Basically a few of his discs are bone on bone. I didn't think to ask the vet if something like this can come on so suddenly. I was a bit in shock after I was told ultimately this disease would get worse and unless I had 8k dollars for surgery I would end up putting him down. Does anyone have any experience with this? Does it just come on suddenly?? Please and thank you for any information, Rufus appreciates it so much!