I think the fact that they are allowed into schools is sickening.
There is a way to combat PETA in the schools...All it takes is a little bit of your time.
Contact your local school and offer to give the students a presentation about working dogs, etc. You will be surprised at how receptive the teachers are to having the dog presentation, and kids remember hands on activities.
You can also get involved in the Trailblazers program that the TDHA helps with.
Here is a link to the Trailblazers info.
http://thenewtdha.com/smf1.5/index.php?topic=589.0