Resource guarding

Resource guarding is a dog's attempt to protect something they value, such as food, a toy, a bed, or even a person, from being taken away or approached. It can range from mild, such as eating faster or stiffening slightly when someone walks past a food bowl, through to more serious, such as growling, snapping, or biting if someone reaches for the item.

It's a natural behaviour rooted in a dog's instinct to protect valuable resources, rather than a sign of a badly behaved or aggressive dog by default. That said, more serious guarding does need addressing, both for safety and for the dog's own quality of life.

Management comes first. This usually means avoiding situations that trigger guarding while a training plan is put in place, such as feeding a dog somewhere they won't be approached, rather than testing the behaviour repeatedly.

From there, many trainers use counter-conditioning, where a person approaching the guarded item consistently predicts something even better being added, gradually shifting the dog's emotional response from defensive to relaxed. Trading up, offering a higher value item in exchange for the guarded one rather than simply taking it away, is a related technique used to avoid teaching the dog that a person approaching always means losing something.

Testing a dog's guarding by repeatedly taking things away to "prove a point" or "show them who's boss" tends to make guarding worse, not better, since it confirms the dog's fear that approach means loss. Punishing a growl is a particular risk here too, since the growl is a valuable early warning that's better addressed at its root than suppressed.