Answer by  
                                                                                          mindygdane (75)
                                                            
                          
                          
                                                           You dog could be suffering from a few things that could cause a red irritated mouth. It could be chewing on a foreign object that has sharp points or edges, it could have chewed on a toxic substance, it could have a bad or abcessed tooth causing the dog top rub it's mouth and scratch it.