It's probably not this, and I really don't want to scare you, but I had a dog when I was younger that hacked a lot. He was pretty old (he lived to be 18) and the hacking was from congested heart failure. He had it for years and years and didn't die of anything related to his heart (he also had diabetes and pancreatitis). I don't think Jasper has that especially since he is so young & active, but I thought I should mention it. He probably just has the flu or a cold. RB Angie used to throw up all the time especially when she was young. She didn't die of anything related to that either.
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