Maybe he just wasn’t interested in it. Also, they might be able to see it but it would not be in red. It would be brown or black. Obviously we can’t know for sure or ask a dog but there’s been a lot of studies on this and the general consensus is exactly what BC said. Although it should be clarified that it’s not that they can’t see the stuff, it just won’t be in those colors.Not true. It appears to depend on the breed. My German Shepherds could not see the red dot the cats were playing with, but my Aussies both can.