Symptoms of poisoning in pets can include vomiting, diarrhea, drooling, breathing changes, seizures, loss of balance / trouble walking, weakness, collapse, or behavioral changes. (petpoisonhelpline.com)
In case of a poisoning emergency, contact your nearest emergency vet. (ctvsh.com)
Like raisins and grapes, which are also toxic, the exact toxin and mechanism of action to cause signs of poisoning in some dogs are not known at this time. (thesprucepets.com)