Shelia I am so sorry your Natasha is gone. I didn't know until I saw this poll.
I think I would rather know. It's never going to make it easier, but at least you would have those last few days to cherish.
When my hearthound Molly went, it was very sudden, from one day to the next. Molly had cancer, but not osteo, her cancer wasn't what took her, a stroke did.
Molly was 12 years 10 months.
Maggie also went suddenly, from a stroke. Maggie had been diagnosed with cancer, also not osteo, but she was doing well, then suddenly she wasn't. Maggie was 11.
Casey went down very quickly too, and there were so many things we didn't know then that we wish we would have. We were ignorant about so many things as was our then vet. If only we had known about tick diseases. If only we had known....something, anything. Casey was our first greyhound and we let him down due to not knowing. We will never know what took Casey, but I will never stop wondering. Casey was only 8 and was DH's hearthound.
Charlie had osteo. Diagnosis to the Bridge was only about two weeks. Charlie was only 6.
So yes I guess I would prefer to know. You can never prepare but you can maybe not have some of the regrets.