I agree with you (no "mean" responses.. they don't work and are unnecessarily cruel). And I agree with the other responses... may very well be age related. Shepherds and chows are not small dogs, and the larger the dog, generally speaking, the shorter the average life span. 9 years is late middle age to early old age... depending on the kind of life the has lived. If you raised him from puppyhood, then he's probably more late middle aged, but it could STILL be a hidden health issue. Dogs get things like cancer, too... so it doesn't have to just be age related. If you adopted him from a shelter as an adult dog, then poor care or possible negletct during his early life might contribute to later health issues and a shorter life span.
When was the last time you took him to the vet for his checkups? I would most def talk to your vet, because honestly, it doesn't sound like he "decided" to do it... sounds like he couldn't help it. Their bowels can be slower to act as they age, like humans, and maybe he just didn't have enough time outside to get them to "move". Usually, a short walk can help, and is good even for young healthy dogs. If it is simple aging, if you are not already incorporating a quick little walk, you might want to.
I hope it is nothing serious.
~love my pooch too.