Indeed it is a difficult decision. I personally likely would not do chemo on a 8 year old boxer, as I think the average lifespan to be about 10 years for boxers though there have been some who have been luckier. Its a big expense to go thru along with the work involved and maybe you get 6 more months or a year with a dog. I don't think CBD helps but it it helps keep her comfortable during our life, then I can see thing it. It probably won't hurt. I'm sorry if I sound cynical I don't mean too, just hard to put it all in typed words . I lost my boxer this past Spring to a brain stem cancer. It happened fairly quickly as he had more tests scheduled for the following week but over that prior weekend he had a seizure and really never came out of it at the ER Vet. I hope the CBD helps