The answer to 'why is my flea odor' is that a flea odor is typically caused by a flea infestation in your home. Fleas are small, wingless insects that feed on the blood of animals, including pets and humans. When there is a flea infestation, the fleas can leave a distinct musty or unpleasant odor in the home.
The flea odor is often described as a pungent, sour, or even a slightly sweet smell. This odor is caused by the feces and decaying bodies of the fleas, as well as the chemicals they produce. The odor may be more noticeable in areas where fleas are most concentrated, such as pet bedding, carpets, or furniture.