If you can not reach your veterinarian on the phone, or if your dog is already showing signs of toxicity, you should go to the nearest veterinarian right away. (thesprucepets.com)
If your felines eat grapes or raisins, be sure to watch out for signs of toxicity. (scratchingsandsniffings.com)
Initial signs of toxicity include GI signs, such as vomiting and diarrhea. (merckvetmanual.com)