A cat that likes to chew may gnaw through a live electrical wire, causing electrocution and burns. Electrical burns, usually in and around the mouth, are pale yellow, bloodless and cold. This kind of burn usually causes serious damage to skin and can result in a buildup of fluid in the lungs. Take your cat to a vet as soon as possible.
If your cat has been burned by chemicals, don't treat him until you have put on gloves, or you risk burning yourself. Remove and dispose of his collar or harness, which may have soaked up some of the chemical. Flush the area with large amounts of cool water and get to a vet immediately, bringing the package or a sample of the chemical with you.