They sure do. Like people their bodies start to let them down when they get older. he wont be liking the fact that he can't crap in the right place, since most dogs have learnt when they were being trained not to crap in the wrong place. make sure you let him know it's ok if he goes in front of you, since he might be thinking he is going to be punished for crapping in the wrong spot.
The criteria I use to decide if it's "time", is if they no longer get excited about going for a walk or doing their favourite thing.
I had a dog dumped on me by her owner. he said he was going to Aussie for 2 months but never came back. I later found out he had the franchise for farmers steam cleaning in Palmy and had ripped them off for thousands. It was quite hard case actually, she was a 65kg rottie and the owner said "don't say this, don't do that she doesn't like it and will get real agro". When I visited her in his home she was growling and all twitchy most of the time so I was a bit worried about her eating one of my flatmates. When she got to my place it was like someone had flipped a switch. She was the friendliest dog and wanted to lick you to death. I realized that the owner was a paranoid wanker and so of course the dog was mirroring that.
Good luck with your boy and give him lots of good times in his final days.
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