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I think that there will always be behavior issue with any pet that you get from anywhere, not just from a shelter. All puppies and kittens have to be housetrained, and then learn manners, and other necessary things, and a shelter dog or cat is no different.
Sometimes, they DO come with learned behaviors from their previous home that have to be worked out; but often, the dogs are given to the shelter because the family is moving, or an illness or other family problem where they cannot keep the dog any longer, not becuase the dog is causing a problem.
Sometimes, people will get a puppy, not realizing that raising and training a puppy is a full-time job, especially when they get a large-breed puppy; and once they learn how much work it actually takes, they give away the puppy.
I have had shelter dogs, as well as rescue dogs, and they were some of the best dogs I have ever had.
I don't think that I have ever gotten a dog from the shelter that was worse than a dog from anywhere else, except maybe the runaways.
Some dogs just like to run, and they will climb out, dig out, or just dash out the gate, just to go and run. Often, they then get lost, and will eventually be picked up by the animal control, and end up in a shelter.
Since the running is in their nature, they will usually try to escape and run, no matter where they live, and you have to either keep them in a kennel where they can't possibly get out, or risk the chance of them escaping and running off again.
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