agreed, I do it by eye, but I wouldn't give a dog garlic.
Because it thins the blood ?I've been giving all my livestock garlic for years with no side effects. I usually give it for 6 or 7 days and then off for a week or two.
Young poultry have it in their water 24/7.
dogs aren't poultry. I'd rather not give it them as I've always been told its bad for them.