There are benefits and disadvantages to both oral and topical flea treatments for dogs. Which type is better for your pup will ultimately depend on your living situation and your dog's behavior. For example, an oral flea treatment may be better suited for a dog with an active lifestyle. This is because active dogs who get in contact with water often may wash off their spot-on treatment. This can also contaminate local water sources and impact wildlife. In contrast, spot-on treatments may be better for dogs who struggle to swallow tablets. Both options can effectively control fleas when administered on a regular schedule.