I have a 2 year old GSD just out of a foster home that we're keeping for a trial period....maybe a husky/GSD mix. Anyway, he was pulled from a shelter last year very emaciated and heartworm +. While feeding him today (seperately from my other dogs), I attempted to pet his head and he growled (no teeth). Is there anything else I can do with him (besides feeding seperately and petting him while he eats)? The foster home said he was doing better, but maybe he's stressed with the new enviorment? He's been around kids, but I also have kids and am concerned. He is also visually impaired, possibly blind from a trauma as a pup. Any advice? I'd really like to keep him.