Our Springer had his usual hour and a half run this morning with no obvious incident. About an hour ago I noticed he was limping on and off. Now he is constantly keeping one of his back legs off the ground.
I've checked the paw and it is fine. When I touched the muscular part at the top of his leg he flinched and became defensive.
My question is - do I leave it - to see if it gets better on its own and if I do, how long should I wait.
I don't like thinking of him in pain. 