Hi gill
sorry to hear that Dylan is having problems. My thoughts and hopes are with you and dylan.
Okay the tablets the vet gave you firstly check to see if they are Rimadyl if so I would advise not to use them....too many side effects.
The tablets given could be some kind of joint mobility drug as to the thinking that he should be more able!
Is he okay when walking, running and playing?
The vet has some idea to the possible cause of the condition but with alot of cases it is frustrating waiting to find out whats up.
Hang on in there and keep smiling