My 10 year old dachsund has been having trouble with breathing. When he gets anxious he starts snorting and a heavy breathing through his nose. He doesn't seem to open his mouth at this time. I try to comfort him and one day we had him at the vet when this happened and she said he was excited. I think there is more to it then just excitement. I was rubbing his tummy today and he started the fit so I know it wasn't because of excitement, he was very docile at the time. I really am concerned about him. The fits are happening more and I am afraid that one day he is going to suffocate when we are not home. Please help us.