My dog went to the vet almost 2 years ago with lameness in one leg - nothing on xrays. Was given medication and better in a day (not even the primary reason for the vet visit). He recently had surgery for an ACL and MCL tear. They declined payment stating what he had was pre-existing and tied to the visit 2 yrs ago. No incidents in between. Tell me how a dog that weighs over a 100 lbs could of gone so long in between the with even a slight tear - very active and rough. They told me I would need to figure out a way to prove the two incidents were not related...I asked how did they prove they were. One sentence on my dogs medical notes cost me $4200.