Resource guarding — when dogs protect food, toys, or spaces through growling, snapping, or biting — is a normal canine behaviour that becomes a welfare problem when managed with punishment that increases aggression risk.
Resource guarding welfare involves both the welfare of the dog showing the behaviour and the safety of humans in the household. Dogs that guard resources are communicating discomfort — they have learned that humans approaching their valued items leads to loss. This is a reasonable inference based on experience: if the dog has had items repeatedly taken away, guarding is a logical protective response. Management through punishment — shouting, physical correction, or forcing removal of items — increases the dog's anxiety around resource possession and escalates the behaviour, eventually producing a dog that bites without the warning signals (growling, stiffening) that allowed humans to back away safely. The welfare cost is a dog living in chronic anxiety about resource access, and the safety cost is increasing bite risk. Counterconditioning that changes the emotional association — "a person approaching my food means something amazing is about to happen" — addresses the root cause without welfare harm.