Our Dog's Journey With Bone Cancer (Canine Osteosarcoma)

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Boo watching over geese

Our dog Boo has always been an adventurer, starting from the moment we adopted him ten years ago at 6 months of age.  With an acre and a half of partially wooded property to explore, our Great Pyrenees would find new things to investigate on a daily basis.  He considers himself the protector of all animals, including wildlife.  And if the animals are smaller than him (and they always are), he adopts them.  Our animals accepted his protection but the opossums, bunnies and even baby snapping turtles probably preferred to do without his guardianship. 

Over the course of his ten years, his adventures haven't always been trouble-free.  He's been bitten in the nose by a copperhead snake.  He felt the wrath of ground bees after stepping on their nest.  Fortunately, the emergency vet clinic isn't far away.  And he's never been graceful, so he frequently tripped over tree roots, stumbled on the gumballs, or just tripped over his own feet.  It's not uncommon for him to have a slight limp for a day or two and then he'd be back to normal.

One recent evening, he raced to the back of the fence to greet the deer that were coming out to forage for the night.  As usual, the deer just stared at him with their usual indifference and then continued on with their business.  When Boo came inside later for dinner, he had a slight limp.  We figured he'd tripped over one of the sweet gum tree roots again and would be back to normal within a day or two.  

But his limp hadn't improved over the course of the next day.  Feeling along the length of his affected leg, we found a small, grape-sized lump on his "knee".  We wrapped his leg and made a vet appointment.  After googling possible causes,  our concern over the possible diagnosis grew.

On the day of his vet appoinment a few days later, the lump had already grown slightly.  A quick radiograph confirmed our worst fears; he had bone cancer.  The x-ray showed a white, opaque mass inside the bone with a "moth-eaten" appearance.   The surrounding walls of the bone were paper thin and barely visible compared to the rest of the leg.  The swelling we felt on his leg was the cancer mass pushing outward through the bone.  

Because the presence of a tumor usually means that the bone cancer has already metastasized, the vet scheduled another appointment to run bloodwork and x-ray Boo's lungs for signs of any other tumors.  The vet explained that this would help help guide our decision for treatment options.  

The vet also provided a detailed overview of how bone cancer "works" and how painful it is, why he was confident it was bone cancer, and then patiently explained some of our options and how each treatment might affect our time left with Boo.  He advised us to have a family meeting later, and possibly get a second opinion. 

  1. Proceed with cancer treatement which included a biopsy, amputation, possbily radiation, and chemotherapy.  Roughly 3-4 months of treatment, extending life up to 12 months or more.
  2. A biopsy, then amputation without chemotherapy; roughly 7 days to recovery, extending life up to 4+ months. 
  3. Provide palliative treatment for pain until pain can no longer be contained; life expectancy of 1-4 months but sooner if fracture occurs.

The thought of amputation was almost as shocking as the diagnosis of cancer.   The vet explained that amputation would alleviate the pain, and because the tumor has eaten through the bone Boo was at very high risk of fracture.  He added that most dogs adjust to 3 legs very quickly after amputation.  But the thought of our 10 year old dog, who was already clumsy on 4 legs, going through amputation surgery and then trying to adjust to 3 legs was hard to imagine.  

The thought of a fracture also scared us so we splinted Boo's leg.  That, along with Carprofen for pain, seemed to do the trick; his limp was gone and he was still happily trotting along into his next vet appointment.  They didn't find any signs of tumors in his lungs, but they cautioned that this didn't mean smaller (less than 2cm) tumors weren't present.  Boo's bloodwork came back great.  The vet said a biopsy would the best way to know precisely how aggressive the cancer was, and recommended we do a biopsy if we wanted to proceed with treatment (amputation, chemo, etc).

We wanted to do right by Boo.  Our other Great Pyrenees died at 10 years of age.  We still felt guilt over putting our 14 year old Lab through 2 surgeries only to lose him a month later.  At 10 years old and a breed life expectancy of 10-12 years, do we put Boo through a sugery and several months of chemo in hopes of maybe having him with us for another 6-12 months?  What would his quality of life be for those remaining months?  What would Boo want?  Any decision felt overwhelming.   

Thankfully the vet put it into the context of how he would evaluate his options if it were his own dog.  We felt that he gave us permission to make the decision to focus on quality of life.  But that left us with the heartbreaking, painful reality that Boo would only be with us a short time longer.

So now we focus on the time we have left and making him feel as comfortable and happy and loved as possible.  It's been 5 weeks since his original diagnosis.  The mass is still there, and there are now several smaller masses that have started to develop further down.  He still patrols the yard (wearing his bright pink splint), wags his tail when we come home, and loves belly rubs.   

He never lets us know when he's in pain, but there is a look on his face every now and again that made it obvious the Carprofen alone isn't enough; so we recently added Tramadol to his pain treatment regimen. The Tramadol seems to make him pant a lot, but otherwise it appears to be helping manage any pain.  His eyes are bright again, ears perky and he just looks happy.

Since he's still in good spirits, and in cherishing every last moment we have left with him, we decided to make a bucket list for Boo.  His risk of fracture limits what we can do, but there are still plenty of other options that don't involve a lot of physical activity.  Most involve food, since that has always been his favorite "activity".


Boo going through the drive through at Burger King for a kid's meal

Boo's journey isn't over yet. We're hoping for many more months with minimal discomfort. However, not a day goes by that we don't second guess whether we've made the right decision for him. And not an evening goes by that we aren't showering him with love.