My dog has recenly adopted a brown stain and we believe it's from her saliva... she has stain all around her mouth, nose, eyes and on her feet from licking her feet. It is also on her bed. I have given her an antihistimine but nothing has helped. Can you offer any advice. My vet tells me it's probably an allergy and there is nothing that we can do unless we want to go thru the long process of elimination. She also seems to gag occasionally and will spit up a yellow substance.


