I have 8 hens that seem to love their 4x8 (8' high) coop but some rarely like to come outside into their 6x10 run. Since I have predators of all sorts (Bears, Hawks, Racoons, etc.) I have to keep them fully enclosed in their safe but supermax run. The run floor is a mix of pea gravel and 3/4 gravel (more 3/4 than pea gravel) and I have two nice roosts for them as well. I even made a dust bath area because I thought the gravel was too rough. (They like to dust bath inside on the deep liter). Can I do something to improve the run? I was thinking of adding some sand to the floor, thinking the stone is too rough or they can't scratch like they might want. Or is it ok for them to come and go as they please? I try to provide treats in the run so they come out but some will not accept the bribes. I do have a very curious lab-mix that loves watching them, but that is all he does. He doesn't bark or try to dig to get at them. Thanks for the help. Mike.