I am not sure, I saw an 10 pointer(dink like 115in) maybe 2.5 year walk right to where the pee was mine and sniff around and walk off no tail action or hackles on back raised....Yet myself in the morning I can smell the coffee coming out and sometimes if I have a sports drink, I can smell this too as different....If I can smell the difference I can guarantee you the deer can smell it too but do they interpret this as danger or different so what.....You know the sideline is if it is coming out as waste in your pee, are you not too off gassing as sweat??