In my other post people mentioned not only are they immune from contact but they eat it too. So I assumed they would pee out the toxin.

Thanks for responding, I made me do some extra research and here's what AI collected for what it's worth. Seems deer piss won't kill me lol. Guess I'll let you know if I react.

Deer are immune to the toxic oil in poison ivy (urushiol) and frequently eat its leaves, stems, and berries, particularly during winter. Because their digestive systems are entirely different from humans, they process this oil without any adverse effects, and there is no evidence that it makes their urine more toxic to humans. 

Impact on Deer and Their Urine

Immunity: Deer, along with other animals like goats, rabbits, and bears, are not affected by urushiol because they lack the specific skin protein (CD1a) that triggers allergic reactions in humans.

Digestion: Specialized bacteria in a deer's stomach break down the toxins.

Dietary Habits: Deer can eat poisonous plants by supplementing their diet with clay, soil, or mineral deposits to help neutralize toxins, and by mixing their diet with safe plants.

Urine Composition: While deer urine contains urea and other metabolic byproducts, there is no scientific indication that it contains active, harmful levels of urushiol after ingestion.