My 18 month old Nigerian Dwarf has developed a kind of wheezing cough. It's not consistent -- sometimes I can go days without hearing her do it. I've noticed it happens sometimes when she's eating hay (she eats really fast), and at those times it almost sounds like she's choking on a little bit of hay and trying to clear her throat. Other times I can hear her do it in the early morning when I'm still in bed (so I don't know if she's eating or not when this happens). She seems completely healthy other than this. Does anyone have an idea what it might be? I have a wonderful goat vet, so I can take her in if need be. Many thanks.