10. Rottweiler
First sign of the struggles to come is the Rottweiler’s nickname: a gentle giant. That alone should prepare you for the oncoming battle with a beast, shouldn’t it? The Rottweiler breed comes from Germany, where the dogs were originally used to pull carts loaded with meat. The dogs can grow up to 27 inches in height and weigh up to 130lbs in full size. Add their trademark rumbling growl to the mix, and you get a pretty intimidating species. These dogs are also beyond temperamental — they need to be present in any action and need to be front and center. Forget about leaving a Rottie on a leash at home while you’re having a party, the dog will bark its paws off to call for your attention and will probably ruin a chair or two in the process. It requires strict discipline in order to get trained properly.