My cats will chase my 40mW green laser pointer in the daytime, but at night, they'll usually just rub their eyes and run away from it. After realizing why I now use a much lower powered laser at night.
If you were to shine your LED into your dogs eyes at night, and then toss a frisbee across a busy road, chances are he'd go after it because his eyes would still be adjusting from the bright light. So, if you don't regularly shine your R2 into your dog's face at night from 5 feet away and then immediately distract him, I don't think there's a problem here.
Remember, it's not the total lumens from LED...it's the fact it's coming from such a tiny source.