I have an australian shepherd who is 11 (as of today, actually!) and who is dealing with some coughing. After running around a lot or rolling, he usually coughs once or twice and makes a lot of noise doing so. We give him heart-worm medication so we know it is not that. We will be taking him to the vets soon, but I'm really nervous as to what it could be. He's had allergies before so I am hoping it is just that (or age).