For my grazing dogs, I give a supergreen supplement of some kind. Sometimes it’s spirulina, sometimes kelp, most often a combo of several things. It’s been so long now since I’ve had a problem with grass eating, it took me a moment to figure out what you were talking about!
I do think that the food can have something to do with tear and saliva staining, but I think it is individual to the particular dog what is causing the problem. For most dogs, it’s a bacterial infection in the tear ducts. The other poster here with the problem is Nectarmom and she found that when she switched to a different food, it started to clear up fairly quickly, but she has a dog with multiple issues and the new food didn’t agree with it.
The best I can suggest is to try something very different from what you are feeding now. As for the goat milk, I really don’t know if it has enough digestive enzymes, but I would assume not. You should be able to tell within a couple days.
