I had a pig dog that had the exact same seizures, once for up to a hour long, had to carry him out. Over exertion in hot conditions can cause a blood sugar level in balance in some dogs, the same “coma” that diabetics can have. Vet said to carry some honey and rub on the gums when ever it happened and it should bring him out of it.. as a pighunter I didn’t want to have a team member with a health condition so I found him a home as a pet and he was fine after that
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