What part of a dogs body do they have fleas?

You should mostly check in the most hairy places on your animal, such as the neck, back, and underside. Another great place to check is near the animals tail; fleas love to hide in areas of dense fur, so be sure to comb these areas with a flea comb, if possible. Fleas are not easily seen by the naked human eye so using a flea comb is a quick and painless way to check your dog's coat for fleas.