Why does my parents' sheltie cough?
I've noticed my parents' 13-year-old sheltie will do one or two short coughs every now and then. I haven't noticed a puffy, swollen chest, and he's fairly healthy otherwise, and active (but a bit overweight). He's been to a vet, but she hasn't said anything about it.
I just flew in last night and notficed it. Dad said it doesn't happen often, but I've heard it twice in a 24 hour period. There's no heavy breathing or weakness involved, from what I can tell. They don't board him, either. They live in the Midwest, where the weather is 4 degrees currently. Can dry winter weather cause it?
I just worry about the dog because he's so beloved to all of us. I want him to live to be 20 like some shelties I've known. (Really!)