Human grade magnesium for humans is the same as for dogs. Try to get it in powder form. Pill form is useless. Go by weight. Usually an adult is around 350mg. So for sure less for a dog. Side effects are not dramatic.....stomach upset, nausea, vomiting, diarrhea and probably a few more. This is a mineral that your body eliminates when you go for a pee. All minerals flushes out. Why tons of people lack in minerals. I know this sounds harsh but dogs are the best "animal" to be tested on for human's health issues as the dog gets exactly what a human has or vis versa. Sad I know but heh two ways too look at this point of view. All this to say......same stuff! Just watch the mg intake for your furball![]()