No they can NOT getv thru halfinch hardware cloth, unless it is not stapled down correctly. then the can bend it, If any one says they can go thru steel wire they are bull shitting u.Now I am really worried. Really? Raccoons can get through 1/2" hardware cloth? I have a large (7' tall) window in the back of the coop. Since it is double hung, I leave the top and the bottom open some. The entire thing is covered, from the outside, by hardware cloth, held in place by screws and washers.(not staples). It is, essentially, at ground level. It seems very secure. If racoons can bust through that, somehow, how does anyone keep their birds safe and still have ventilation? Hardware cloth is not cheap. I thought it was about as secure as I could get for fencing!
Good news about the dogs being rehabilitated. I have a couple retrievers who are very interested in my birds as they are bred for it and, in fact, trained for it (particularly they like those guinea fowl). We have had one session with the e-collar, but the birds are not free ranging yet, so I suspect there will be another lesson or two as that occurs. I know what exactly what is meant by "now the dogs act like they dont even see the birds..." I hope my boys are as smart ...because no one is going nowhere ....