I've just started taking Vitamin D3 high doses, and I know many on here will be on them. PLEASE KEEP THESE OUT OF REACH OF PETS!!! My Standard Poodle consumed about 45 x 5000IU capsules which my vet said would have been fatal or caused severe damage if I hadn't got him there so fast. They induced vomiting and fed him charcoal, fortunately he must have eaten them on waking and they were removed from his stomach before absorbing into the bloodstream, but had he got them at bedtime it would have been too late. D3 or Cholecalciferol is a rat poison and highly toxic to dogs & cats, there is no antidote. It causes high potassium & calcium levels resulting in kidney damage, and usually death. The poison takes 1 to 2 days for signs to appear, by then it's too late. I wouldn't want anyone to go through what I did last week, 4 blood tests have given my boy the all clear thankfully.