If you have any experience with older dogs, would you please let me know if this situation has ever occurred for you and if so, what you did and what was the outcome? About a month ago our older **** hound mix (11-ish) started limping slightly. Over a couple of days it turned into a situation where he was barely walking, had rapid breathing (although not panting) and we thought he was dying. X-rays revealed NO breaks and a completely healthy bone structure with no tumors. Vet thought it was a bad muscle sprain/tear. He was put on extra pain meds and muscle relaxers. He seemed to get better for a bit but now we are back to where we started. He is barely walking right now, rapid breathing and just standing and barking. I will be calling the vet first thing in the morning. Please, if you have had a similar situation, let me know what you did for your furry friend.