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Meelliissaa I've been in this situation many times. I won't tell you what to do, just my process when I have to make that decision.
I watch for quality of life decline. Your dog will tell you when it's time. Useually.
Last year had 3 pets pass. 2 dogs and a cat. This is the checklist I go by in my head.
Are they eating and drinking enough?
Have they lost control of going to the bathroom?
Quality of life, are they in pain, or miserable?
If all 3 are a yes I can't hesitate. If not I'll get them checked out and see if it's something treatable. If not, I do what I can to make them as comfortable as possible.