Medical/Opinions of what’s wrong with Cannoli

Medical/Opinions of what’s wrong with Cannoli
Hi everyone, So Canolli started doing this limp about 4-6 weeks ago so we took him to the vet at that time and the vet examined it and did X-rays. They came back clean. No bone or structural damage to it, nothing on his spine that might be pushing on nerve. Bloodwork all came back good. He’s in no pain which is what makes it so bizzare. Anyway, they gave him an anti inflammatory and we went home. The AI didn’t end up helping so we took him back last week and the vet did physical tests on it and he showed no signs of pain or discomfort. Were are going to a doggy neurologist so they can do an mri and determine if it’s a neurological issue. In the meantime they gave him a steroid (pregnasone) that he’s been on for 4 days and we’ve seen no improvement. Does anyone have any experience with this or any opinions that might be of help? I hope he can get back to normal since he’s only 7yrs old. Sorry for the long description and thanks in advance for any thoughts.