I have a 5month old lab puppy and noticed when we go on walks and she is sniffing i sometimes hear a thumping type sound. Anybody else experience that? I took her to the vet but she didn't do it. They were thinking allergy related but she has no signs of allergy issues and i am not giving her pills without a confirmed diagnosis. I tried google searching the issue but not many results. I found a Pitbull video with a very similar noise but no diagnosis mentioned.