We have had our dog buddy for about 8 yrs. He was between 4 &6 when we got him. This past winter he started limping and we treated him with arthritus meds, turns out his shoulder started to buldge out and xrays and biopsy tell us he has a large tumor that is an aggresive soft tissue cancer. The vet said with the type And age there is nothing we can do. We have pills to keep him comfortable. What I am struggling with is how long to wait till we put him to sleep. I don't want to keep him doped up all the time or in pain but most of the time he seems normal just limping...... its an hard decision......