We are not veterinarians, and this is not veterinary advice. Every clinical statement below is attributed to a named veterinary source and linked, so you can check it against the original rather than take our word for it. Where the evidence is genuinely unsettled, we say so instead of picking a side. If your dog is in pain or cannot bear weight, contact a vet today. Last updated 2026-08-24 · How we source our content

If surgery is not possible for your dog — because of cost, age, anaesthetic risk, or your vet's assessment — you are looking for an honest answer about what happens next. Here it is, with the numbers.

The single most important variable is your dog's size

This is not a nuance. It is the finding that should shape your whole conversation with your vet.

In reported outcomes based on owner evaluation of lameness:

85% of small dogs (under 15 kg) were normal or improved at 36 months. Only 19% of large dogs (over 15 kg) were normal or improved at 49 months.

That is not a small difference. For a terrier, conservative management has a strong track record. For a Labrador or a Rottweiler, roughly four in five dogs were not normal or improved on owner assessment.

More recent work comparing surgical (TPLO) and non-surgical treatment in small-breed dogs under 10 kg found both groups improved in the short term with no significant difference between them — while still advising cautious consideration of conservative treatment. Veterinary sources summarising the picture describe conservative management as potentially benefiting small, low-activity dogs, with less predictable results generally.

So if you have a small dog, the data gives you real grounds for the conversation. If you have a large dog, you should go into it knowing the odds reported in the literature.

Rehabilitation is not optional

The second finding matters nearly as much, and it is the one most owners are never told.

Among dogs treated non-surgically with rehabilitation, roughly 66% were reported to have successful outcomes at one year. For dogs managed non-surgically without rehabilitation, reported success across several retrospective studies ranged anywhere from 19% to 90% — a spread so wide it tells you those cases were not being managed consistently.

The practical reading: "conservative management" and "resting the dog at home" are not the same thing. The version with structured rehabilitation behind it has meaningfully better reported outcomes than the version without.

If you are choosing this path, budget for a qualified canine rehabilitation practitioner. That is where the difference appears to live.

What conservative management actually involves

Veterinary descriptions of non-surgical treatment typically combine:

• Pain management, prescribed and monitored by your vet
• Exercise modification — controlled, specific activity, not simply cage rest and not normal walks either
• Weight management, which is the single largest mechanical factor you control
• Physical rehabilitation — targeted physiotherapy, often hydrotherapy
• Joint supplements, where your vet considers them appropriate
• Braces or orthotics, in some cases

Note where bracing sits in that list: one component among several, not the treatment itself. Anyone selling you a brace as "the non-surgical option" is describing one part of a plan as though it were the whole thing.

What it does not do

The American College of Veterinary Surgeons describes cruciate disease in most affected dogs as a gradual deterioration of the ligament over months or years, and notes that partial tears almost always progress to complete tears.

Conservative management does not repair the ligament and does not stop that process. What it aims at is function and comfort — the dog using the leg, with the joint stabilising over time through scar tissue and muscle, and pain controlled while that happens.

It also does not remove the arthritis question. Joint instability drives osteoarthritis, and that is a consideration in both paths.

When it is most commonly discussed

From veterinary sources, non-surgical management comes up most often where:

• The dog is small and not highly active — the group with the strongest reported outcomes
• Anaesthetic risk is elevated — older dogs, cardiac or respiratory disease, or brachycephalic breeds where airway status complicates anaesthesia
• Surgery is financially out of reach. This is a real constraint and it is not a moral failing. But the honest framing is "the best option within our means," not "just as good"
• A vet or rehabilitation practitioner is actively supervising a plan rather than the owner improvising

The questions to put to your vet

1. "Given my dog's size and activity level, what outcome would you realistically expect without surgery?"
2. "Is there meniscal damage?" — this affects both the recommendation and the outlook, and owners rarely think to ask
3. "Can you refer me to a canine rehabilitation practitioner?"
4. "What is the specific activity restriction, for how long, and how do we progress it?"
5. "How will we monitor the other knee?" — cruciate disease is bilateral often enough to plan for
6. "At what point would we change course and reconsider surgery?"

That last one matters. Conservative management is not an irreversible decision, and agreeing a review point in advance stops it drifting into "we just never went back."

If you have a large dog

We are not going to soften this. The reported figure of 19% normal or improved at 49 months for dogs over 15 kg is the number you are working against, and large breeds are also the group where cruciate disease is most common in the first place.

That does not make conservative management wrong for your dog — anaesthetic risk, cost and age are all legitimate inputs, and your vet may still consider it the right call. It does mean you should hear an explicit opinion from your vet about your specific dog rather than reading a hopeful article and deciding.

Find an ACVS board-certified surgeon here if you want a specialist assessment before choosing.

Where bracing fits

Honestly: the objective evidence is thin. We cover it properly in our assessment of whether dog knee braces are effective and in our guide to comparing braces. In brief, the published studies measuring what a stifle orthosis does to weight bearing are very small — single-digit and low-double-digit numbers of dogs — and the researchers themselves call for more work.

If bracing is part of the plan your vet sets, measure properly, because a brace that does not fit does nothing at all.

Frequently asked

Can a dog recover from a torn ACL without surgery? Reported outcomes differ sharply by size: 85% of dogs under 15 kg were normal or improved at 36 months, against 19% of dogs over 15 kg at 49 months. Rehabilitation appears to matter a great deal — around 66% success at one year with it.

How long does conservative management take? That depends on your dog and the plan, and it is a clinical question. The reported outcome studies measured at points well beyond a year, which tells you this is not a short process.

Is conservative management just crate rest? No. Veterinary descriptions combine pain management, controlled exercise, weight management, physical rehabilitation, sometimes supplements and sometimes bracing. Unstructured rest is the version with the least predictable reported outcomes.

Will my dog get arthritis either way? Joint instability is associated with osteoarthritis, and it is a consideration under both treatment paths. Ask your vet how it applies to your dog.

Can I switch to surgery later if it is not working? Ask your vet to set a review point in advance. That question is worth raising at the start rather than after months of uncertainty.