i have him on glucosamine. been on it about 6 months because he was growing so fast. got the liquid form for horses from a feed store. it worked great. last night he got his leg hung up in my desk chair and before i could get up to help him he collapsed. got him a doggie wheel chair today. makes it alot easier for me to get him in and out the house for breaks. he seems a little better today as he is flexing his legs when he is laying down so my hopes are better. will know alot more tomorrow after he goes to the doc. thanks guys for making me feel better about all this. it has been a tremendous help.