I might add, since I've been through this twice. The specialist that we went to, did a lot of TPLO procedures. The waiting room was full of dogs with the same 'hair cut' on a back leg, and the underbelly sling. Big dogs, little dogs, mixed breeds, pure-breeds, overweight, old, young-you name it.
It seems like an epidemic! Never heard of it when we were young, and we had lots of active dogs. Maybe they just never called it an ACL tear, and maybe they didn't have a surgical fix-but it sure is common, now!
I asked the Vet tech about why so many dogs with ACL injuries. She said that she figures their office had done every Saint Bernard, Great Pyrenees, and English Mastiff in the Tri-state area. So, she basically blamed the breed type. Well, that didn't explain all the other dogs in the waiting room.
I asked the vet. He said it was because of bad breeding and overweight dogs.
Whatever, if I knew a young vet student-I would tell he/she to go into ACL surgery repairs!