Many dog lovers believe there’s no such thing as a bad dog, just bad training. And while we don’t disagree that a good owner along with proper training and socialization can make a world of difference, we have to admit that some dog breeds are best suited to experienced owners.

Those very traits that make certain breeds so good at the jobs they were bred to do, like hunting big game and guarding their owners and property, can make them a challenge for someone who’s never trained a dog before. [ See Also: 18 Best Breeds for New Pet Owners ]

For instance, a dog bred for hunting, birding, working, or running long distances will work until his job is done, regardless of weather or distractions. When that same breed is kept as a family pet, his circumstances change, but his drive and instinct to go, go, go? Not so much. Therefore, he needs an owner who’s prepared to work with that level of vitality to keep him from engaging in destructive behaviors.

And consider the traditional guard dog, bred to be on the alert for anything that’s out of the ordinary. In his original job, that might mean keeping an eye out for dangers and predators, but as a member of the family, it means he needs firm and entirely consistent training. While some dogs might understand a good deal of nuance — that it’s OK to get on the couch with the kids, but not with Mom and Dad — a dog bred for guarding duties thrives on a dependable environment since knowing what is regular and routine is absolutely necessary to determine what’s not.

One other item to keep in mind: Some of these breeds may not be allowed in certain homes due to restrictions on the lease or insurance policy.

We’ve already shared what dogs veterinary professionals deemed best for new owners, and now we’re sharing which breeds those same 218 experts thought were the worst choices for first-time dog owners.

Please note: We don’t mean to imply these are “bad” breeds, and in no case is any breed friendly or aggressive clear across the board. However, if you’re a first-time, inexperienced dog owner, these are dogs you might want to wait to bring home until you have a few years of training under your belt.

Also on Vetstreet.com: