Chooks and kids are very compatible. If anything you have to make sure the kids don't terrorise the chooks because then they won't lay. Roosters are another story

I grew up with 2 dogs, 2 cats and 6 chooks. They were always free to roam the garden, and they certainly learnt how to hold their own against the other pets. You could always have a "chook time" where the dog is locked up for a while in the chook house while the chooks scratch around in the garden. They love to eat the insects etc.

Let us know how you go!