We were in the same situation in December. The vet told us if we were asking the question of putting them down , we already knew the answer . I truly feel your pain and am sorry for what you may have to do.
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Same here, my wife's 14 year old keeshond developed cancer, I stayed up with her until 4:00 one Friday while she cried and tried to find a place to sleep. The next day, told the wife to call the vet and he came out and did what you said. I loved that old girl to the point that I would have killed her myself rather than see her suffer one more day.When i put my 15 year old Border Collie Sasha down, I had a vet come to my house and he hung out for a while in the floor talking and petting her for about 30 minutes until i was ready. she was laying in the living room floor right next to me when she went to sleep. Her ashes are still with me today.