Hi..Look like some kind of mite, perhaps? Quite possibly something your dog picked up from plants indoors or out, and totally harmless, but it's difficult to tell by that picture. If you've noticed a lot of scratching and/or skin irritation lately, definitely try to save one in a plastic baggie or other container and run it by the vet, just in case.
i tried to get a better photo.. its very tough cause they are soo small..They look like Spider Mites. Try to get a better photo and talk to your local cooperative extension if you have one in your State.
Complete Guide to Spider Mites - Pest Prophet Blog
yes, i looked at the link.. they dont look like the pics in that link..READ at the link I shared. See if the images and information seem to line up with what you are seeing.
Take a few into your local extension service and see what they say on bug ID