Fleas are tiny, wingless insects that feed on the blood of warm-blooded animals, including dogs, cats, and humans. They can jump great distances, up to 100 times their own body length, which allows them to easily move from one host to another.
When a flea jumps onto a person, it can bite and feed on the person's blood. This can cause itching and irritation, and in some cases, can lead to more serious health problems, such as flea-borne diseases.
To prevent fleas from jumping from dogs to people, it is important to keep dogs and cats free of fleas. This can be done by using flea prevention products, such as flea collars or topical flea treatments, and by regularly vacuuming and washing pet bedding and furniture.