Are Dogs Color Blind?

I just learnt that dogs are red-green blind but I notice that Coco prefers pink and orange colored toys. The pink octopus used to be her favourite but not the pink pig. That's because the octopus squeaks and the pig doesn't. She ignores her grey dog (even though it squeaks) and her white teddy bear. This squeaky orange orang utan now ranks number 1 with her. However she ignores the pink legless sheep even though it squeaks. I think what attracts Coco will be something pink or orange, can squeak and has dangling limbs. I believe Wawa likes the pink sheep because everytime he's excited he stuffs it in his mouth. He also likes whatever Coco likes.