ANY DOG CAN SUFFER AN ILLNES or injury at some time in his life. Your pug may itch and scratch from allergies, hot spots, or flea bites; experience the unpleasantness of diarrhea or vomiting; or develop lumps or bumps that should be examined by a veterinarian. Knowing what to look for and what to do in case of these potential problems will help you deal with them if and when they occur.