No, actually canines have the abilities to see quite a few colors. Wolves see more color than dogs and fox. I know dogs can see orange, green, white, black, grey, purple, brown, and orange. (not sure about orange)
Oh yea, they can see the entire spectrum in hues of dim yellows greys and blues, some dark brown and orangey colors, while some colors can reach a purple-ish tone but don't go to the actual color purple 8D
Basically, dogs almost never see in grey. The color green is interpreted as grey, but everything else is a dull color of yellow-ish or blue-ish shades 8D extending to cream and light blue to dark brown and black.