Anyone know how to make a homemade dye pack?

Basically, I'm trying to catch some sneaky neighbors messing with my dog. i was going to boobytrap the bushes around the perimeter of my backyard with fishingline and dyepacks so when he/she crosses over they'll come in a nice of blue/pink/red/yellow/whatever. I'm also installing wireless cameras to have video proof of everything. Can anyone offer insight on this?

**note** I DO NOT WANT TO HURT THEM, just mark them and shame the person.

Thanks in advance!

Answers:
No you don't want injury or a law suit. There are defense products available but I will not advertise on this site. Email me and I'll make a suggestion on how to stain their hands.

Other answers:
get an electric fence, it'll shock em everytime
get an electric fence, it'll shock em everytime
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