Aww, I'm sorry for your loss ILV.
Pets are like family and it's hard to see them go.
My Mom had a dog once that would "wrestle" with people (really just their hands/arms, haha) despite being only ~10/13 pounds. She'd get so worked up, she'd flip herself over and flail around so much that she'd repeatedly smash her own head into the hard floor. It was so loud we'd always go, "Ooooooh" when she did it because it sounded like it hurt quite bad. But it never stopped her from flailing and throwing her head backwards onto the floor.
By the time the "match" was over, your arms would be red because she'd get so into it and she was a Poodle/Shitzu mix!
My dog is really just accident prone but he's never actually gotten hurt. He's almost a year old but he's "all legs". We don't know what he's mixed with so we're not sure if he'll fill out or if he'll always be tall and muscular but he's very strong. We took him out this morning for play time in the snow and he went crazy, he loved it! But he lost his footing on some ice and WHOOPS, his feet went out from under him and he hit the ground. Didn't make a peep, got back up and kept running. He's been to the vet many times, even when I wasn't certain he was sick (I suspected a UTI once but he was fine), and they've never had anything negative to say. He's got all his shots, he's at a healthy weight and still growing, and he's happy.