The barn i'm moving Mayder too some of the fencing is *maybe* up to his chest and I did slightly worry about it. But they've had draft crosses and warmbloods on the property and never have gotten out. Also the only part of the fencing that's lower is to their backyard technically and all the driveways have gates that are closed at all times unless somebody is wanting out or in. Of course right near the low partsis the barn and all they hay. So he'd probably head for that first more then anything.
Which a person who used to board would go there really late at night and she left the gate open and Mayder did actually get out. The BO threw a huge fit and didn't tell me that he got out and blamed me for "horses" getting out when I was not at fault for it. He was a drama queen and said they got to the rode... they went up to the hay feild and were just chilling eating hay.