Had the same happen to my golden lab. We were putting a laying shed back together and the pest control jerk came to lay poison. Dopey shite cleaned his van out an a little red sachet of poison was left in the rubbish he chucked out, my young pup got it an we found her chewing it, rushed to vets, £300 lighter she was fine. Got it early. Pest control man got a bollocking but refused to pay. Lazy inconsiderate shite