Hi Asia and Gibson! I'm sorry you are in the limbo phase right now, it's tough not knowing for sure what caused the fracture. At least he's now on the mend. Be sure to check out our What to Expect articles when you get a chance.

As for at-home chemo, there used to be metronomics which was a pill given orally, but over time it's been shown to be less effective than once thought. Most oncologists will say don't bother. There are now good immunotherapy options like the Yale Vaccine but they still require more than a handful of vet visits and many oncologists are using chemotherapy alongside it.

The thing about chemo is that it's not right for everyone, for exactly the reason you are describing. And that is perfectly ok! While it can statistically give dogs a better shot at longevity, it still can't guarantee it. Some dogs will outlive the prognosis when they have chemo, some will not even if they do have chemo. And some dogs will defy the odds when they didn't have any chemo at all (our Jerry is one, he lived two years without chemo, but he did have metronomics during his last year). 

This is a situation where you really need to focus on quality of life for Gibson. He is a unique dog with unique needs, and treating cancer doesn't have to be an all or nothing approach if you want to respect his emotional needs and ease your concerns too.