If you or anyone else has a serious dog problem I reccommend you build a really secure run welded wire and a secure coop then I would run a couple strands of chicken wire along the bpttom of the coop and run infact on my run I have one wire running around the coop about 4 inches up off of the ground and I have another wire a foot above that both are on the 5 in extended insulators that way a digger cant help but get a zing... For those of you who have a really really bad dog problem I would consider a second line of defense that being a free standing electric fence using fiberglass step in posts and 4 t- posts for secure corners put the wire on the lowest knotch of the step in posts and the next 3 or 4 up from there.... basically if anything gets in from there they have earned it!!!!! I use a superbee fencer but Im not sure thay are available... anyway if you go to TSC they have a fencer for 19 that would be OK for most apps but they also have one for 45 and if I had an agressive dog that would get the point across... personal experiance I have 2 curious dogs and both of them got into the fence once and now I cant even call them to me if Im near the coop....