this might be too close to the idea from the other dog peeing but I get why you did it with some changes... I will submit it... maybe it would be good for you to try to do a bear marking a tree with signs on it....
My first thought when read your client ideas... the animal marking his territory was a Dog marking his territory, but you´re right I´ll make a try with the idea of the bear.
Entry #93 pretend to be, based on your bear idea, I remember when my dogs get to me, he is always dirty in his paws, always let a mark on my tshirts :P hope this explain my idea, try to add the DNA chain but I need to think how incorporate it.