I find this an interesting subject, I do not suppose any of us can prove that dogs are actually colour blind, but my dog, quite literally hates anything grey!
The squirrels are very unfortunate to be in my garden, as are the wood pigeons.
She seems to pick the colour grey up very quickly, and particularly if it moves.
No objection is ever shown to blackbirds or blue tits or even the woodpeckers. If I serve a grey dog food, will she not eat it, and bark at it instead?
Unfortunately, my daughters two cats are grey, so it would probably be best if they never met, it could bring a whole new meaning to the words cat food.
I do hope the England team, do not wear the grey away strip, during the world cup, as the whole event could prove unwatchable.
Every time Rooney scores, and waves his arms in the air, I feel a new T.V.could be required