We don't use the lasers...only for the cat once in a blue moon, and only if Katie is outside or in another room and has NO idea it's out. She's one of the obsessive ones. It wasn't from chasing lasers though, flashlights got her. When we are in the yard at night, the power goes out, anything that involves a flashlight or head-light, she will go nuts. She gets over it quickly, but I could see it becoming a major problem. Our other dog Roxy could care less.
Just a couple nights ago, when Katie was sick, she went outside to go potty. It was dark, and I wanted to see if she went, what came out, and just watch her. Grabbed a light so I could see, and she immediately stopped what she was doing, showed more energy then I'd seen all day, and would not go back outside until she was darn sure that light was up for good. She will also immediately notice any light on the walls, etc. So, I'd be careful, but some dogs seem to be fine playing with them every now and then, some dogs are a little wacky. We aren't sure exactly what breed she is, but some Border Collie definitely seems possible ;-)