Resource Guarding in Dogs: Signs, Causes, and What to Do

Resource guarding is a relatively common behavior problem in dogs. It is defined as a dog using avoidance, threatening, or aggressive behaviors to retain control of food or other items in front of a person or other animal⁴. The Merck Veterinary Manual classifies it under possessive aggression when directed at a individual who approaches or attempts to obtain an object the dog possesses⁵.

The signs fall along a continuum. At the mild end, a dog may freeze, give a hard sidelong glance, eat faster, or lower its head deeper into the food bowl¹. Beyond these subtle signals, a dog may growl, show teeth, or snap¹. At the most intense end, a dog may bite anyone who approaches¹. The ASPCA adds that guarding can range from running away with a coveted item to full-blown aggression such as biting or chasing a person away².

Other body language signs include stiffening the body over an item, a hard stare, whale eye (showing the whites of the eyes), lifting the lips, and low growling³. The Veterinary Partner page from VIN notes that mild signs can include a stiff or crouched body posture, pinned back ears, lip licking, and physically blocking access to the resource⁴.

Guarding possessions from humans or other animals is normal behavior for dogs². Wild animals that protect their valuable resources such as food, mates, and living areas are more likely to survive². The AKC notes that resource guarding is a valuable instinct for feral dogs because it allows them to survive on limited means in the wild³.

Young puppies may be more prone to guarding because they often have to compete with littermates for limited food². Resource guarding may have a genetic component and occurs in males and females of any breed⁴. It can develop at any age and may appear gradually or begin suddenly after a change in environment or routine⁴.

Any dog can be prone to resource guarding. It is not specific to one breed³. The environment a dog grows up in can also influence whether guarding develops³.

Resource guarding does not have anything to do with dominance⁴. The idea that dogs guard because they do not understand their place in the pack has been scientifically debunked⁴. Using force and punishment in a resource guarding situation often makes the behavior problem worse and can cause the dog to fear you⁴.

The AVSAB warns that repeatedly taking food away from an eating dog might actually teach defensive aggression by creating perceived competition over the bowl¹. The Merck Veterinary Manual states that almost without exception, physical punishment including prong collars and electric shock collars can make an already aggressive dog worse⁵. The ASPCA says not to punish or intimidate a dog when it guards food, because doing so is dangerous and unnecessary².

If mild signs like freezing or stiffening are ignored or punished, the dog may escalate to more overt aggression such as growling, snapping, or biting⁴.

Safety is the first priority. Use baby gates, crates, or exercise pens to separate the dog from people or other pets when a valued resource is nearby⁴. Feed the dog in a separate room or behind a barrier². Do not attempt to take away stolen or scavenged food from the dog².

If children live in the home, the situation becomes unacceptably risky². Children are more likely to get bitten because they are less able to recognize a dog's warning signals². The ASPCA advises not to attempt behavior exercises with any child under 18 years of age².

Some dogs develop resource guarding after reaching adulthood. A change in behavior or aggressive behavior may indicate an underlying medical issue³. Resource guarding may be caused by an underlying medical problem, especially if it starts suddenly in an adult dog⁴. A veterinarian should rule out medical causes before starting behavior work⁴.

The treatments used for food guarding are desensitization combined with counterconditioning². The idea is to convince the dog that it is wonderful when you approach while eating, because you bring something better than what is in the bowl².

The ASPCA outlines a staged program. In Stage One, stand a few feet away while the dog eats and toss a special treat toward the bowl. Progress to Stage Two by taking one step closer before tossing the treat. Each day, take one step closer until you are within two feet². Later stages involve standing next to the bowl and dropping a treat in, then bending down to offer a treat by hand, then touching the bowl, and finally lifting it briefly².

The AVSAB describes a similar approach for non-aggressive dogs: call the dog's name in a happy voice while eating, praise and toss a high-value treat like chicken, then gradually require the dog to step away from the bowl to receive the treat¹.

Studies have shown that reward-based methods are more effective and humane when managing behavior problems such as resource guarding⁴. The AKC trainer recommends starting 6 to 8 feet away and tossing food toward the dog, then gradually moving closer as the dog's body language becomes relaxed and happy³.

If the dog is already showing aggression, do not attempt these procedures without professional coaching and supervision¹.

Contact a board-certified veterinary behaviorist or a certified applied animal behaviorist if your dog is showing aggression around resources¹². This is especially important if the dog has bitten or is likely to bite, if children are in the home, or if the behavior is escalating³.

Your veterinarian may be able to help directly or refer you to a veterinary behaviorist⁴. Sometimes medications can help, especially if anxiety is a cause of the behavior⁴.

The treatment of resource guarding needs to be highly individualized for each dog and household⁴. Dogs often need a combination of behavior modification, training, and environmental and management changes⁴.

There is no single proven timeline for how long behavior modification takes. Progress depends on the individual dog, the severity of guarding, and consistency of the program. Some dogs improve quickly; others need long-term management. Resource guarding behavior may never diminish completely, resulting in long-term management to reduce the behavior⁴.