I'm talking when I was about 6 years old. Our old Cat Harold. It IS a bad thing to see. Thing is with our cat..He had a LOT of issues going on from very old age to VERY bad arthritis and who knows what else. My Mom had him put down a bit later but I believe it was more because of the arthritis. He'd howl every time he stood up. Dogs...I have only known of one other person who had a dog with seizures. It was a fella I worked with at NAS. All I know is that he'd monitor the dogs breathing / airway (Just like people) I THINK there is meds out there for it. Good luck. I know how much your Beagle means to you.