Updated September 10, 2026first published August 21, 2026Rewritten in full against the current regulations
Retiring a service dog isn’t usually a decision you get to plan. Mine ended on an ordinary day in February when my dog jumped into a pickup truck and said ouch, and I thought he had a sprain.
He didn’t. He had bone cancer, and by the time we found it the bone in his back leg was nearly gone.
The vet gave him twelve to eighteen months at best, warned me he probably wouldn’t survive the surgery, and told me to be prepared for the time he did have to be poor quality. That was five years ago. He’s asleep on the floor beside me as I write this.
Last updated: August 2026
Read this first. Mr. Big’s outcome is not typical, and I won’t pretend otherwise. Published median survival after amputation alone is around four months; with chemotherapy, about nine. He got sixty-one, without chemotherapy. He is an outlier, not a promise. This is one dog’s story from one handler — it isn’t veterinary advice, and your vet knows things about your dog that I never will.
The first sign was nothing
February or March 2021. Mr. Big and Tanker both jumped up into a pickup truck and both of them went ouch. Both limped for a few days. Ordinary dog stuff.
Tanker got better. Mr. Big didn’t.
So I took him to my vet. Possible torn ACL — keep him quiet, cut back the activity, here’s something for the pain and swelling, bring him back in a month.
A month later the general swelling had turned into a definite bump. Let’s keep an eye on it. Same medication.
Then in May, over about two weeks, that bump swelled into a lump I couldn’t ignore.
He was never in obvious pain — and that’s the part that matters
Through all of it, Mr. Big was not wincing. Not crying. Not whining, not fidgeting with it, not trying to lick it. He never once told me it hurt.
I need to say that as loudly as I can, because most of what you’ll read about canine osteosarcoma describes a dog in obvious pain. Cornell’s own description of the disease says it “is often very painful.” Usually that’s true. It wasn’t true for my dog.
The only thing that alarmed me was how fast it grew. That’s it. That was my entire warning.
If you are waiting for your dog to tell you it’s serious, please understand that a dog can be losing a bone and still behave almost normally. Stoicism is not a good sign. It’s just stoicism.
Trust yourself and ask for the x-ray
About four months passed between that first limp and anyone taking a picture of the inside of his leg.
I’m not writing that to blame my vet. Limping dogs are usually soft-tissue injuries, that’s the sensible first assumption, and he was treating what the evidence in front of him suggested. Most of the time that approach is right.
But it wasn’t right for us, and the thing that finally changed it was me. On the third visit I stopped nodding along:
“No. I want you to do an x-ray and see what’s going on. This is very disconcerting to me.”
That is the single most useful sentence in this entire article. If your dog’s limp isn’t resolving — if the swelling is becoming a shape, if something is growing faster than an injury should — ask for imaging, and keep asking until you get it. You are not being difficult. You are the only person in the room who sees this dog every day.
I wish I had said it in March.
The Friday
I dropped him off on a Friday morning expecting to hear it was fluid, or a cyst, or something with a boring name.
The surgery rang at about three in the afternoon and asked me to collect him at six — closing time — because the vet wanted to speak to me in person.
And at that point I knew. Life was making a major change and something really bad was wrong.
I waited until every other patient had gone. Then I asked to see the x-ray myself, because I needed to see it with my own eyes.
There it was. The bone in his leg, where the swelling had been, nearly gone. Eaten through.
He hadn’t taken a biopsy. He didn’t need to. “I’ve seen this enough to know. It’s osteosarcoma.”
The options, exactly as they were given to me
| Option | What I was told |
|---|---|
| Keep him comfortable | Medicate him until he passes |
| Euthanasia | Now, before it gets worse |
| Chemotherapy and radiation at Texas A&M | Around $20,000. No guarantee. If he came through it, roughly 12 months |
| Amputation | 12–18 months at best. He’s a big dog — he likely won’t survive the surgery. He may give in to depression. It’ll be hard for him to get around. “You’re going to have to teach him how to walk again — hop, actually.” |
And hanging over all of it: if the cancer had already reached his lungs, none of it mattered. At that stage of progression, it probably had.
He told me I didn’t have to decide anything on the spot. I wouldn’t have anyway.
The weekend
I took my boy home and spent two days crying and holding him and trying to face a choice I couldn’t get my head around.
Both options felt horrible. And I couldn’t fathom what he wanted — that was the unbearable part. Being in total control of this beautiful soul’s life.
Was I ending it to save him from worse pain? Or was I about to cause him worse pain in the short term, just to keep him in my life?
That was the question. I genuinely did not know the answer.
How I decided
In the end I stopped trying to reason it out. I got down and hugged him as close as I could and I asked him what he wanted.
Those golden eyes always communicated with me. This time it was very clear.
He was not ready to go. He wanted to be with me as much as I wanted to be with him.
I knew what it meant. He would never be a service dog again — and what replacing a service dog costs and how long it takes is a question I was nowhere near ready to think about — I’d already lost that, I just hadn’t processed it yet. But he would still be my best friend, and that was never in question.
We scheduled the surgery. Chest x-rays and bloodwork a week later. The vet told me again: twelve to eighteen months at best, most likely not good quality time. Be prepared.
Surgery was 24 July 2021. His left hind leg.
Six hours later
Everything I’d been warned about was wrong.
When my vet went to check on him after surgery, he was already standing up on his own. When she opened the gate to let him out to go to the toilet, he hopped straight out there by himself.
There was no “I’ll need help.” There was no learning to walk again. He was hopping from the start, and my vet was in shock.
I had to change exactly one thing in the house — how he gets up onto the bed to sleep with me at night. That’s the whole list. No ramps, no rebuilt home, no reorganized life.
His recovery was clean. No infection. We did have to redo his stitches, and that was the sum total of the complications.
What the numbers actually say
I want to be straight with you here, because you may be reading this with an x-ray of your own dog in front of you.
According to Cornell’s Riney Canine Health Center:
- Osteosarcoma is most often diagnosed in large and giant breeds, around seven years old — one of the trade-offs that comes with choosing a giant breed as a service dog
- It usually grows on the long bones of the legs
- “Often, at the time of diagnosis, the tumor has already spread to the lung” — visible on x-ray or not
- Median survival with amputation alone is about four months
- With amputation plus chemotherapy, about nine months
Mr. Big had amputation alone and lived sixty-one months and counting.
I’m not telling you that to sell you hope. I’m telling you because you deserve the real numbers alongside my story, and because both things are true: the median is four months, and my dog is asleep on the floor next to me five years later. Somebody has to be at the far end of the curve. It turned out to be him.
Ask your own vet where your dog sits — the location of the tumor, the chest x-rays, his age and general condition all matter more than anything I can tell you. If you are reading this before anything has gone wrong with your own dog, it is worth knowing what veterinary care costs and how to cover it now, while his record is clean. A limp noted before a policy starts can count as a preexisting condition.
The five years
I still expected the twelve months. I genuinely thought he’d be gone before the next Fourth of July.
So I spent it enjoying him. Car rides — he loves car rides. Pup cups. Checkups. Hanging out like a regular dog, which after eight years of working was its own kind of gift. If you are at the other end of this and still working out whether a service dog is right for you, that is where I would start. A retired dog is not a finished dog, and what an older working dog needs from his food changes at exactly the point most people stop thinking about it — seniors need more protein, not less. It is also when the joint supplement aisle starts looking tempting, and most of what is in it does not work.
There was one bad scare. A lump appeared on his spine near his hip and it absolutely killed me — I was certain it had come back. It was removed and biopsied. Fatty lipoma. Benign.
Then the Fourth of July came round again. And then the next one. And the next.
Five Fourths of July. Five birthdays. Five Thanksgivings. Five Christmases.
At his annual checkup recently, my vet and I talked about how well he’s done and what a surprise it’s been. She was the one who told him he wouldn’t make it through the surgery.
There was no last day
People ask about the last working day. Whether there was a final outing, some sort of goodbye to the job.
There wasn’t, and I think that’s worth saying, because it’s how it usually goes.
I didn’t know it was his last day. He jumped into a truck and hurt himself and I thought he had a sprain. That was it. That was the end of eight years of work, and I didn’t notice it happening.
If your dog is still working today, that’s probably the only reason to take from this — you will very likely not know which day was the last one either. Take the picture. Make the fuss. Do it on an ordinary Tuesday.
Where we are now
He kept up with the rest of the pack right up until recently. The work he used to do is written up separately, and he still does some of it out of habit. Now his hip is giving out.
Honestly, I’ll be surprised if he makes it through Christmas this year.
I wake up at night wondering if he’s still breathing. I walk through in my head how I’m going to memorialize him. I wonder if I’ve been good enough to him. Whether I’ve loved him enough.
If you’re facing this decision
I can’t tell you what to do. I wouldn’t dare — I know exactly how it feels to want someone to just tell you, and I know that nobody can.
What I can tell you is this.
Listen to your heart, and ask your service dog what he wants. I know how that sounds. Ask him anyway. I suspect the answer will surprise you as much as it surprised me — that he wants to stay.
And would it have been worth it even if it hadn’t turned out this well? If I’d got four months instead of five years?
Resoundingly yes. At the very least I got more time to let him know how much I loved him too.
The thing I most want you to understand
And yet, as I sit here writing this, tears streaming down my face, I remember all the adventures, all the good times, all those quirky little faces he gives me. All the hugs, the times he calmed me, the times he stood between me and someone not being so nice to me. All the times he watched my 6. And what an absolute wonder he is, and I thank my lucky stars for the best friend I’ve ever had, ever.
So yes, we are near the end of our journey together and I know it, but — there is nothing I wouldn’t have given for these last 5 years. Nothing.
People often mistake a service dog for a tool, like a car. I can wholeheartedly say — they are NOT. I often wonder if they are angels sent to us when we need them the most.
Frequently asked questions
What are the first signs of osteosarcoma in a dog?
Usually lameness or reluctance to walk, and a firm localised swelling on a limb. In my dog’s case the limp came first and was mistaken for a sprain, and the swelling only became obvious later.
Is osteosarcoma always painful?
No. Cornell describes the disease as “often very painful”, and that is usually the case — but my dog never showed pain at any stage. He did not wince, cry, favor it visibly or lick at it. Do not use the absence of pain behavior to rule anything out.
How long do dogs live after a leg amputation for osteosarcoma?
Median survival is about four months with amputation alone, and about nine months with amputation plus chemotherapy. Individual outcomes vary enormously. Mine lived five years without chemotherapy, which is exceptional and not what you should expect.
Can a dog live well on three legs?
Many do, and far more easily than owners fear. Mine stood up unaided six hours after surgery and hopped out to the garden by himself. The only change I made at home was helping him onto the bed.
Does a service dog have to retire after an amputation?
In practice, usually yes for physical tasks. A dog who has lost a limb should not be doing mobility work, bracing or anything weight-bearing. Retirement is about protecting the dog, not about whether he is still capable of loving you.
Should I amputate my dog’s leg?
Nobody can answer that for you, and be wary of anyone who tries. Ask your vet about the tumor’s location, whether the chest x-rays are clear, and your dog’s age and overall condition. Then make the decision that lets you live with yourself afterwards.
This article is one service dog handler’s personal account, not veterinary advice. Osteosarcoma is a serious disease and treatment decisions should be made with your own veterinarian, who can examine your dog. If you are facing this, ask about referral to a veterinary oncologist.
Sources
- Cornell University College of Veterinary Medicine, Riney Canine Health Center — Osteosarcoma in dogs
- UC Davis School of Veterinary Medicine — Canine Appendicular Osteosarcoma