When dogs write poems

Technically they just can't see red. http://prntscr.com/4i7mon Kind of ironic how we give them red balls to find in the green grass when we should give them blue and yellow balls

Dogs can see blue and yellow.

dogs are not colorblind...they regard red (and orange) and purple (and deep blue) as black and green as white. Yellow and blue are visible for them.

I thought its grey?