In general, human toothpastes are not good for dogs although I wouldn't go as far as saying they are poisonous. When we brush our teeth, we spit out the paste afterwards & rinse - dogs can't do this usually (when none of the ones I know can
) so they will swallow the toothpaste. Human toothpaste contains all kinds of chemicals that may cause tummy upsets if swallowed so it's best to use toothpastes made for pets if poss.