The answer to 'why is my gutter pet stains' is that pet urine and feces can accumulate in gutters, causing unsightly stains and odors. This typically happens when pets, like dogs, use the gutter area as a bathroom. The uric acid and other compounds in pet waste can discolor and degrade the gutter material over time.
Symptoms of pet stains in gutters include visible yellow, brown, or black discoloration, as well as a lingering unpleasant odor. If left untreated, the stains can worsen and lead to more serious issues like gutter corrosion and blockages.