My Shetland pony was diagnosed with arthritis in his left knee 2 years ago after the vet did the flexion test. Pony has PPID (Cushings) & often has lami during the summer months. He has Prascend each day & 1/4 sachet of bute every 2 days. During the last few weeks there have been no signs of lami so I am confident his mobility difficulties are due to the arthritis rather than sore feet/lami. What puzzles me is that some days he moves almost normally e.g trotting a short distance across the field. On other days he is very stiff & reluctant to move although once he gets started on his daily walking exercise his movement usually improves. I can't find a pattern to this behaviour. His better days do not match the days that he has bute & the cold wet weather doesn't seem to affect his arthritis either. Are these inconsistent symptoms normal for arthritis? Has anyone had the same experience with their arthritic horse or pony? I don't find my vet very helpful & a book written by a vet that I have just read doesn't mention symptoms that vary from day to day so am hoping to get some help from someone with first-hand experience