We went out to my parents' house for Easter dinner and brought Cole. My parents have a semi-wooded yard against a pretty thick woodland backdrop. I took Cole out for a run to play some Frisbee so that he would poop, and on my first throw the disc veered toward a small tree in the back of their lot. Cole was so focused on the Frisbee, he either didn't notice the little tree or couldn't distinguish it against the woodland backdrop - and ran full speed into it, hitting it with his right shoulder. Poor boy started whining and crying. He turned toward me to try to come back, but his arm was sticking out at a funny angle (OMG!) and he just sat down crying. By now I'm running over there and I start palpating his shoulder, arm, and paw. All are fully mobile and he doesn't cry when I touch anything so I just continue to rub and massage the tissue. He rolled over on his back licking his lips, poor fella was so confused.
So after a few minutes I let him up, and the doof just gets up and runs around the yard like nothing happened. I think I left my heart back where I'd been standing when I saw the whole thing happened.
I continued to let him run as much as he wanted and he didn't turn up lame later that night nor this morning. I think we're lucky. Man these dogs are tough.