Your chickens are very calm! Whenever our neighbor's dog comes over, my chickens go CRAZY! (Running away to the furthest end of the run.) That picture you show looks quite funny, considering what my chickens do when they see a dog.
My chickens will just walk a little faster if he comes near. They're more afraid of my drake (he doesn't have enough ducks, so he chases the hens in hopes of mating)
Ugh yeah... My collie rolls in the poo... Gross!! My Beagle is NOT allowed in their coop anymore as she will eat and eat and eat till she pops... Even more gross. They also keep our neighbours cats out which is handy.