I found this diarrhoea relief in a book it is quite effective. Please note however if it doesn't work after 36 hours at the most go to the vet. Take 2 tablespoons of corn flour or arrowroot & moisten with cold water to a thin paste in a thick bowl, preferably metal. Pour on boiling water, stirring quickly, until it clears like old fashioned laundry starch. Add 2 or 3 tablespoons of white sugar & 3 or 4 tablespoons (sml can) of evaporated milk & cool it well - an egg whisk will keep it from thickening too much. This drink can be repeated 2 or 3 times during the day until the condition clears up. If symptoms continue take the dog to the vet.