My two dogs are very different. Ive had nothing but trouble with Zander using a crate, from the day i brought him home. We even had him on anxiety medication because hed make himself bleed while he was in it. I tried for almost a year, and finally just threw in the towel. almost six months later, The other, Zuki, was a shelter dog. So he was very used to a crate and when I yell at him he runs into it. Two very different dogs. But now that i have them side by side Zander is more comfortable, but he still cant be by himself in one. My advice is this... boxers are very playful curious dogs. Once they learn they can get into something its very hard to break them. I know it seems cruel, but I think it really is safer for my dogs. Im always worried they'll get into the garbage and eat something they cant digest. plastic wrap? aluminum foil? or medications? If i were you and you can get your dog it accept a crate, id do it. definately