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OK, after a bit more research I'm wondering about wavelengths. According to Wikipedia's page on colour vision, humans are trichromats, meaning they have three different types of colour-sensitive cells in the eye. The human eye is most sensitive to green around 532nm, which is why it looks...

Thanks all for the comments! On the lethal intent - lethal force thing, we were concerned about the ethics of blinding the animals but not killing them and wondering whether that would be worse - as Guyfromhe says, they're not exactly healthy in the first place but is it right to cripple them...

You jest, but one guy did suggest a Super Soaker (big capacity water gun toy) filled with some sort of nasty liquid... which hastily progressed into "what if we fill it with kerosene and use it as a flame thrower?", which would probably be more dangerous in his hands than letting the dogs attack us!

Airhorn - that's an idea, as long as I don't scare the crap out of the cyclists and warn them in advance! It's got the easily portable, pretty safe, inexpensive to recharge, advantages we thought a laser would have. I guess our next step is to test those and see whether they're more or less...

I meant to say, we've tried a number of ultrasonic repellers, including one that looked like a megaphone, and they don't seem to have a lot of effect. Or rather, they don't have a consistent effect: sometimes the dogs slow or stop, sometimes it seems to encourage them! As for aiming, I suppose...

Hi, I may need to apologise for being a n00b but it looks like you guys are the best people to ask for advice - and advice that it doesn't seem easy to find on this forum or several other places I've tried. I'm wondering whether it's possible, or worthwhile, to build or buy a laser device to...