Are dogs color blind?

The dogs are able to distinguish and to make the difference between colors, but it is supposed that they see other colors. For example, what we see as blue might be green for them, and a white might be green. Unfortunately, we can’t check those affirmations if we can’t talk with the dog’s, can’t we? The theories issued since now about how dogs see are not generally accepted, but we know for sure that dogs make a difference between colors. 

When do dogs stop growing?
Is dog insurance worth it?
When do dogs go into heat?
Why do dogs shake?
When do dogs stop teething?
Why do dogs have whiskers?
How do dogs get fleas?
Why does dog pee kill grass?
How do dogs get worms?
Why does dog lick paws?
How does dog breeding work?
Where dogs came from
How are dogs and wolves different?
Relationship between dogs and wolves
How dogs were domesticated
Where dogs live
Where dogs like to be rubbed
When dogs die
Why dogs eat grass
Why dogs lick people
Why dogs howl
When dogs eat grass
When dogs lick you?
When dogs throw up?
When dogs attack?
How dogs were domesticated?
How dogs drink water?
How dogs mate?
Are dogs carnivores?
Are dogs color blind?
How dogs see?
Are dogs allowed on trains?
Are dogs mouths clean?
Is dog food good for dogs?
Is Dog Island Real?