There are many reasons why dogs may have fleas in their homes, but the most common reason is that they were exposed to fleas outdoors and brought them home. Dogs may be exposed to fleas by running around outdoors and then bring the fleas home. These fleas may hatch and multiply on your dog's skin or in his hair.
In addition, dogs may have fleas at home because there are already fleas in the home and the dog is exposed to them outdoors. These fleas and bring them home. To prevent your dog from getting fleas at home, you can consider giving it flea preventative medicine, maintain your dog's internal hygiene, and clean your home regularly. If you notice fleas on your dog, you should take him to the veterinarian immediately so he can get the right treatment.