A police handler demonstrates an attack situation with a German shepherd dog during a tour by HRH... 
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People who are overly zealous in disciplining their dogs will probably make the animals even more aggressive, not less, according to a new study by veterinarians at the University of Pennsylvania.
The study involved 140 persons who turned to the animal behavior experts at Penn because their dogs needed help. The findings are consistent with other studies showing that discipline may not be the best way to correct an errant pet's attitude, but some of the statistics are a little surprising.
It's not startling to learn that kicking a bad dog will probably make him or her angry and likely to bite, but it turns out that even yelling "no" can have the opposite of the desired effect.
"This study highlights the risk of dominance-based training, which has been made popular by TV, books and punishment-based training advocates," said Meghan Herron, lead author of the study, published in the current issue of Applied Animal Behavior Science. "These techniques are fear-eliciting and may lead to owner-directed aggression."
In other words, if you kick your dog because he tried to bite you, he might end up owning your foot.
The study involved dogs that were so problematical that their owners were willing to seek professional help. A high percentage of the dogs became even more aggressive when they were kicked (43 percent), or the owner growled at the dog (41 percent), or something was physically removed from the dog's mouth (39 percent), or the dog was rolled onto its back and held down (31 percent.)
In many cases it didn't take much to make the pooch more agitated.
The researchers found that 30 percent of the dogs became more aggressive when they were "stared down" by the owner. That's defined in the study as "stare at dog until he/she looks away." Only 13 of the owners admitted they actually "growled" at their dog, and nine of those dogs (41 percent) "responded aggressively."
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