Hi I found your post and yes, ACL are very common. Our dog Bandit has had two surgeries one for each leg. He had his first one 2-3 years ago and recently had his second one. The first time we had it done, it was very scary and sad to see them helpless. We both cried because we are childfree and our dogs are our children. We spoil them to death. However, the second one was much easier. If you would like to write to me I can give you more information. We had a great surgeon and staff at our vet clinic. Make sure to check them out before going through with it. Keep me posted and good Luck