Sadly, this isn't a joke. My ever faithful Labrador who is my shadow was quick off the mark when I dropped a tiny half grain tablet this morning, as a result of clumsy, slow hands. I tried to scrape what I could out of his mouth but he had chewed it up very well. The vet doesn't open until 8:30, and even the emergency service takes an hour to organise a consultation, so in the meantime I'm worried about what it could do to him. My first concern is for his heart. Can anyone help?