One of the best things to bathe it with is salt water, one teaspoon of salt in a pint of tepid water, get a piece of cotton wool and soak it in the water, sqeeze it onto the wound and wipe it off with some clean cotton wool soaked in the salt water also, do this every 3 hours, remember to keep using clean cotton wool all the time otherwise you will reinfect it. I always use this on my dogs if they get a wound or a cut foot, it's a very good antiseptic. If it happens to be an animal bite that is different, you need to take the dog to the vet because animals carry a lot of bacteria in there mouths and that can be serious, any way try the salt water it very rarely fails.