Hi Dee and Gunner, welcome! I'm sorry that you are facing this decision, it's an especially tough one when it comes to larger dogs. Has he had any scans to check for metastasis? 

If it's any comfort, one of the longest lived Tripawds members we had here was Cemil, a very big Anatolian boy! I believe he made it to close to 10 years old, he was truly amazing.

So yes, if Gunner needs to lose weight, that will make a big difference in his mobility. Ask your vet how to help him get rid of the pounds slowly and safely. You can also see our Tripawds weight loss tips.

Traction is especially important. Throw rugs and carpet runners with rubber backing are essential, wherever he prefers to walk through the house. Most dogs are smart enough to stick to those paths where they can more easily walk. Trimming fur between his toes and paw pads will also help.

Check out our Tripawds Recovery Shopping List for some more ideas.

Just want to throw this out there but there is a procedure called cementoplasty that is pretty new but is helping some dogs with osteosarcoma to keep their limbs. It's not offered everywhere since it's so new, but it may be worth looking into. Cost is about the same as amputation with a shorter recovery time.