<human>: Can you provide a brief rundown of the text in within 3 sentences?

A couple months ago we rescued this little mixed dude. He was about 27 pounds, has only gained about 6 more. Not sure exactly what his mix is, maybe some ACD, maybe some kelpie, but we're guessing he's going to top near 40 pounds.  

About a week after we got him we noticed his left knee was clicking a bit and he would never sit straight, always pointed the knee out or kept it far less bent than the other. A dozen trips to the dog park later and he's hobbling and clearly in pain. 

The vet we've used for over 20 years (and trust) says his ACL is 90% torn and is recommending TTA surgery that we can't currently afford. He's on metacam right now and can go for long walks, but if he romps around too much the knee starts to bother him again. They're also saying that surgery in one leg can cause stress in the other and lead to needing THAT leg operated on as well. UGH.  

I'm not sure what to do here and my head is spinning. We lost our 15 year old ACD about 6 months ago am I'm pretty stressed about making the right choices for our pup's long term health. They're saying without surgery he'll end up an arthritic mess, but then also said the surgery may lead to ultimately the same issues except in the other knee. To top it off they're saying it needs to be done sooner than later due to cartilage issues but he may not even be done growing.
<bot>: is a "very" torn ACL something a medium dog can recover from without surgery? are knee braces a viable option? what would you do?*