Hey my sister is also having problems with joint stiffness in her springer/cocker cross spaniel. She took him to the vet after he had trouble getting up after a long walk the previous day. The first vet said it might be something called spondolysis (not sure about spelling) and have given him antibiotics for infection. He is still not better so has second course of antibiotics and has to go for xrays next week.
Are the glusomaine tablets working for your dogs stiffness?
The dog, Barney is only turning a year in February so very young still :(
Thanks
Bailey