Even though it might be a touchy subject for you, I must admit I laughed when reading your comment about the dogs enjoying a good murder.
For the size of the run, people usually use 10 square feet per chicken as a rule of thumb, but if you have the space and plan on keeping them mainly in the run, there is absolutely nothing wrong with giving them much more space. Having two runs to switch between to take the stress off the lawn a bit is also worth considering, the more space they have, the easier it will be to keep at least some of the grass alive. Someone with experience of this might give you some numbers on how much lawn you need for it to not turn into a mudpit.
Good luck with your chickening adventures!
For the size of the run, people usually use 10 square feet per chicken as a rule of thumb, but if you have the space and plan on keeping them mainly in the run, there is absolutely nothing wrong with giving them much more space. Having two runs to switch between to take the stress off the lawn a bit is also worth considering, the more space they have, the easier it will be to keep at least some of the grass alive. Someone with experience of this might give you some numbers on how much lawn you need for it to not turn into a mudpit.
Good luck with your chickening adventures!