[krb]

Yellow and blue have different values (intensities) as well as hues (color shade).

If you really want to see if dogs can distinguish color, you need to select two different hues with the same intensity (i.e. they would appear as the same shade of gray if photographed in B&W).

[CobaltBlue]

The dog preferred yellow and blue about the same, and both more than black, white, or red. Whether there is any significance whatsoever, remains to be seen.

We were both very disappointed that the sponsor screwed up the rules. I thought there was a problem to begin with but was assured it was OK. Our vet was willing to supervise, but we were told all that needed to be done was that the vet approve the study, and not supervise. Oh, well. I know it's well intentioned.

When I was in high school, as a science fair project a girl froze her gerbil to see if it would come back to life when she thawed it. No. Duh. Well, that's the reason they have strict rules about experimentation on animals.