Dogs should be treated for fleas once every month. Flea treatments are typically applied monthly to keep dogs protected continuously, as fleas are a year-round risk and their life cycle can be very short, around 12 days. Puppies should start flea treatment at around 8 weeks of age and may require more frequent application initially, depending on the product and flea exposure. Certain products like spot-ons, oral tablets, collars, and sprays vary in how often they need to be applied, but the common recommendation is monthly use. It is important to follow the instructions of the specific flea treatment product used and to consult with a veterinarian for the best product and treatment frequency based on your dog’s lifestyle, breed, size, and health status. Consistent monthly flea treatment helps prevent flea infestations and associated health risks such as itching, allergic reactions, anemia, and transmission of parasites. Additionally, maintaining a clean environment and washing your dog's bedding regularly supports flea control. In summary, monthly flea treatment is the general guideline to effectively keep your dog flea-free and protect their health.