What happens if dogs eat currants?

True currants, which are sold fresh or dried, are safe for dogs in limited amounts. In excess, they can induce stomach upset, but fortunately, they don't cause any long-term problems. ... Grapes, raisins, sultanas—and Zante currants—can cause kidney failure and death in dogs, even in small quantities.

Will one currant kill my dog?

Your suspicion that just one raisin or grape will not kill a dog is correct. Even a little dog can get away with it. ... A small amount of either fruit (raisins are dried grapes) can prove deadly by leading to sudden kidney failure and the inability to produce urine.