Don't worry about the dogs - there are some running around but they are all friendly and we never saw any dirt other than the horses - there was loads of snow so might have been buried but we had no problems whatsoever and I also have a 6 year old. He spent alot of time playing with the "wild" dogs.
to b honest i came across loadsa dog shit, and i go loads on my board one time, also at night time there are alot of dogs around the hotel olymp area, and they can chase and cause a riot, as they bark and surround u in big packs, not bein funny, but u should buy knife out there for protection
i have also just got back from there, and yes i saw a lot of horse and dog shit.
one of my friends had a bit of dog poo on his board and some how got it on his face, yes it was very funny at the time but wat if it got in his eye we all know about the worms in dog shit. and yes u do get a lot of wild dog 1 night about 4 was running after us funny story to tell but not something you would like to be doing