Mystery of the green spots

If you read this at all, you know I have 5 wirehair dachshunds. Greta, Fritz, Liesl, Oscar, and Bruno.  In order:  blond (wheaten), black (black & tan), white (white + various spots - dapple), chocolate, and chocolate dapple.  As varied as their colors so goes their personalities and quirks.
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Big G, Greta, blondie is the smallest and the oldest.  She is a doll who has her own way about anything & everything.  She is afraid of nothing, well, except a roll upped newspaper.  She goes to bed early and will sleep past 8 a.m., nearly 3 hours after the others have rolled out to beg for breakfast.   Generally she eats every other day.  Food has minor interest to her.  Still she has grown to 12 lbs.  The diet has started.
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We left the house the other day and isolated the dogs while away.  It was lunch time when we returned.  All dogs came into the house, the kitchen to be more specific.  My wife was preparing some delicious lunch for me.  Greta walked across the kitchen, picked up her empty food dish and threw it as best she can.   I can take a hint.
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Greta did not want to eat breakfast that morning.  Popping her dish meant something to her and to us.  She did it again.  Fritz sat close watching and hoping.  Nothing makes Fritz happier than a bit of spilt food (and before you say it:  Spilt is a word.  I don't care what any book says or the spell check on this machine - spilt is a word !!)  Spilt food is good.
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I dumped a half cup of dry Iams in her dish and she ate.  Important fact....the food dish is right beside a water dish.  She finished.  I picked up the dish.  We ate lunch.  Fritz was sad that she didn't SPILT anything.
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Lunch over and the wife is cleaning up a bit.  She said, "What are these green spots on the floor?" There was a string of green 1/2 inch spots making a curved line across the kitchen floor starting near the water dish.   We looked and studied,  Green spots.  The wife said something about them starting where Greta was eating.  I joked maybe she was bleeding green blood.  Not funny.
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So I picked the fuzzball up.  The pad of her left front paw was green.  We took a wet towel and washed the pad.  Green just kept coming off....The mystery:  what did she get into that left something green on her foot.  When she ate, the paw hit water activating the green dye.  It must be a grandular something that she stepped into and it stuck between the toes.
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The lovely spouse and I have searched the house over, the garage over, the back porch over -- nowhere is there anything that produces green dye.  It looks a bit like the color of that green fertilizer that puts out nitrogen for small plants.   Can't find any of that messed up.    Where did the green dye come from?  She won't tell - prolly afraid of the roll upped newspaper.   I am open to suggestions.
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as I type, Greta is asleep on a pillow by my toes.  She just had a dream and moaned her way through it.  She is such a dear and the diet has begun.
Think little green spots.
out
mtz