Dogs who behave like this don’t distinguish between people or animals who are going to take something away from them and anyone who’s just passing by. It only matters what they think might be a threat to their items. Dogs are responding to the trigger, not the actual action. This is one reason why resource guarding is problematic and potentially dangerous behavior in a pet. When left unchecked, resource guarding can become problematic, and even dangerous, behavior. Unfortunately, resource guarding, in some cases, leads to biting. Bestselling author and animal behaviorist Patricia McConnell, Ph.D., notes that resource guarding in dogs is also known as “possessive aggression.” From a dog’s point of view, possession is nine-tenths of the law. Signs of resource guarding in dogs include stiffening their body over an item, a hard stare, “whale eye”, lifting their lips, low growling, and baring their teeth. Any dog can be prone to resource guarding, it’s not specific to one breed.