Can only one of my three dogs have fleas?

Yes, it is possible for only one of your three dogs to have fleas. Fleas can infest a single dog while the others remain unaffected, particularly if they have different grooming habits or if the infested dog has been in contact with an area where fleas are present. However, fleas can easily spread, so it's important to check all dogs and treat them as necessary to prevent an infestation. Regular flea prevention is recommended for all pets in a household.