The answer to 'why is my rat odor' is that a rat infestation in your home can cause a distinct, unpleasant odor. Rats produce strong-smelling urine and feces, and their nesting materials can also contribute to the odor. This odor is often the first sign that you have a rat problem in your home.
The smell is typically described as a musky, pungent, or ammonia-like odor that may be most noticeable in areas where rats are nesting or spending a lot of time. The odor can be particularly strong if there are dead rats in your walls or attic. Rat urine and feces can also lead to the growth of mold, which can further contribute to the unpleasant smell.