CRITICAL: FROTHING MOUTH AND SEIZURE IN MY DOG

My dog abruptly started going through a terrible seizure. He's with saliva coming out of his mouth and can't stay still. I don't know what to try. Please help! Is this an emergency? I'm so scared, he's my best friend. I Think My Pet is Having Seizures, Excessive Drool It's incredibly frightening to witness your dog/your pet/my furry friend havi