Hi, I recently took my labador out to the beach and as he jumped into the water he landed funny and came out limping. On inspection I discovered that his back leg knee joint was badly swollen but he was still putting a bit of weight on it so I presumed it was just sprained and we've been resting him since. Its been nearly a week now since the incident and the swelling hasn't gone down at all so I'm starting to get a bit worried about it. He is putting weight on it when he walks, but when he's standing still he lifts it off the ground. Do I just need to rest him more or could it be something more serious? He doesn't appear to be in much pain but he has been very lathargic.
Thanks
Sarah