My dog is 8, almost 9 years old and I believe that he is a Kelpie. He eats and drinks normally and plays around and is just a happy dog altogether. I have noticed that he squats to go poop but little to nothing comes out. He doesn’t appear to be in pain and when I feel around his stomach he doesn’t react to anything. Is it something that’s a cause for concern or is it due to old age? He’s not lethargic, not wincing in pain or anything like that