Join Date: Sep 2007
Dogs Name: Ori AKA Harold DogDog (Hairy Dog), RIP Caesar, Katana, Kip, Capri
Titles: DogDog Mouthe Extraordinaire; Kip Mr. Behavior; Capri Mis-Behavior
Dogs Age: DogDog 2 yrs?; RIP Kip 11 yrs; Capri 7 yrs; Katana 9 yrs; Caesar 13 yrs
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My post got lost....I'll try to repeat as much as I can remember. I'm not an expert, someone else will probably chime in here, but.....
The symptoms you describe, his age and the fact that you have been training in agility makes me think of a strained ACL/CCL, or Patellar tendon/ligament. Does he have any knee tenderness or swelling? Dobies are so stoic you may not be able to get a response from him just by prodding around, but the fact that he is limping tells you something is going on.
A trip to the vet would be a very good idea--in fact, that would be my next step, without delay. It might even be a good idea to go to an orthopedic vet if there seems to be joint injury going on.
For right now...keep any exercise on the ground, slow, controlled (on-leash) and off of hard surfaces. A non-slippery area to move around on might help prevent further injury too.
Mental exercise can tire them out too, without a lot of strain on the legs. Nose-work, mild obedience or trick training may help keep that energy in check.