You're clearly not going to get a consensus here - I think you have a 50/50 answer!
In many ways the right floor colour is determined by your room and the light available. Some well lit spaces work very well with dark floors whilst others need a lighter floor. Add to that the light reflective qualities of different floor surfaces and you have even more choice. It's well worth asking yourself what you would choose if the dogs weren't part of the equation: once you've established your personal choice then it's perfectly possible to make only a few compromises to get a floor that works for them too.
In my opinion: some dark colours show the dirt more easily, consider what happens with black cars... Light floors don't show too much dirt if you choose one with a flecked, mottled finish
I opted for a mid range stone colour from Karndean -
Knight Tile Portland Stone ST13 - it's been down a year and I've never regretted it. Coffee and tea drips just disappear and it can actually be quite dirty before it looks like it needs a clean! I have it in the utility (dog) room and all through the kitchen. I use a turtle mat by the back door and another in front of the range cooker to absorb grease spots or exploding sauces. The colour works very well in my space and the dogs don't slip on it either. I tend to ensure they are fairly dry before they come into the kitchen but a quick wipe with a dog towel in the utility room is enough to remove to odd paw splat.
A quick hint: borrow some tiles or an offcuts of your preferred flooring before deciding. Move it around to see what it looks like in sun and shadow and very importantly have a look at it in both daylight and artificial light. I think flooring is one of the most important decisions in a room and it's an expensive one so you don't want to make mistakes if you can avoid it. Choose the floor before you choose your wall tiles if you can - they are millions of options in wall tiles!