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Hi. My name is***** Thank you for your question. If you weren't concerned with this cold fecal material, would you feel that he's doing very well? Is he eating and drinking normally? Is he being social and interactive? Is there any way for you to take a rectal temperature of him?
Cushing's disease will have dogs drinking excess water. That is definitely one of the big signs that owners are asked for when questioning for it. The arthritis can definitely cause a more sedentary lifestyle. To help with this, you should talk to your vet about the possibility of a trial of oral anti-inflammatories to see how he may respond to that. I'm going to be honest and say that as far as the cold poop, fecal material comes out pretty close to the body temperature it was in. Could it be in that environment longer than realized? Could he be defecating near an older stool and that one is picked up and felt to be more cool? Could the material of the poop bag be insulating the warmth from it from your hand? I know if I use a really thin poop bag it feels much warmer than if I use a grocer store bag in a pinch.
I'm going to be very surprised if his rectal temperature as determined by a thermometer is low. If he's acting as good as he is, it just doesn't seem to add up. I hope everything goes well at the vet's office later this week! Here is a good link on arthritis management that you can get more information to talk to your vet about.