Rebecca Hosking, with a picture of her collie Dave, says she stumbled on a battlefield when she tried to find out what was best to feed her dog.

By Rabecca Hosking for MailOnline

Rebecca Hosking decided to turn detective when her collie fell ill. What the woman who led Britain’s first campaign to ban plastic bags discovered will alarm every animal lover.

It was early spring this year and my other half, Tim, and I were down in one of the lower meadows on our Devon farm, coppicing willow while keeping half an eye on our ten-month-old border collie, Dave, as he indulged in his favourite pastime: moth hunting. Not that we knew it then, but that was the last time in months we would all be worry-free.

Half an hour later, as we sat down for tea back at the house, we heard a horrible thumping sound from outside.

The following seconds are still a blur. I don’t remember getting to the kennel, I just recall pulling Dave into the recovery position and putting a blanket under his head. He was convulsing violently,legs wildly paddling, frothing at the mouth.

Dave, we would later discover, was having a grand mal seizure and that thumping sound was his head uncontrollably banging on the kennel floor. It was a sound we would come to dread and one we would sadly hear all too often.

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