Shit Happens

My mother-in-law recently got a new puppy, who is a Aussie Doodle mix.  He is full of energy, runs like the wind, and from what I noticed, happens to poop a lot.  I haven't owned a dog in a long time, so he may poop normally but to me, it always seems like when I take him for a walk or bring over to my house, he poops 2-3 times.  And he is quick to do it.  Yes, he does the tell-tale circle the wagon move prior to the event, but sometimes it is really hard to find the exact spot, until you are standing in it (as you all surely know); And since dog poop comes out in the primary camo colors (green/brown), it is very hard to spot in the grass. 

Why hasn't anyone figured out a way to help change the colors of dog poop, so that it is easier to locate within a yard?

I'd think that if a dog ate kibble that was dyed or drank water with a dye, that his/her poop would change color and be easier to spot in a green/brown yard.  I'd think that the ideal natural dye would be to use red beet juice, but perhaps there are better solutions out there. 

Thoughts?