Blocking and creating space task

What blocking and cover look like

In a front block, you stop and give a cue, and your dog moves to stand sideways across your front, creating a small zone of personal space. In a side block, the dog stands or sits at your side facing outward. Handlers often use these in checkout lines, on transit platforms, or when talking with someone who stands too close.

Cover, sometimes called watch my back, positions the dog behind you or facing the opposite direction while you are still, such as at a counter or an ATM. The dog is trained to give a gentle signal, like a nudge or tail wag, if someone approaches from behind. The American Psychiatric Association describes both tasks among those PTSD service dogs perform.

Conditions blocking may help

MedlinePlus lists feeling on edge and being easily startled as PTSD symptoms. In crowded places, those reactions can make ordinary errands exhausting. Panic disorder can also lead people to avoid places where attacks have happened, and social anxiety can make close contact with strangers overwhelming.

A predictable block or cover routine can reduce the sense that someone might come up unseen, which may make it easier to stay in a store or on a bus long enough to finish what you came to do.

• Hypervigilance and startle responses with PTSD
• Panic symptoms in crowded or confined places
• Discomfort with people standing too close, as with social anxiety or agoraphobia
• Sensory overload in busy spaces

Blocking task research

In a 2020 study of 217 post-9/11 veterans with PTSD, handlers rated cover among the three most important tasks and used it about four times a day on average. Blocking to create space was rated moderately important and used a few times a day. Cover was linked most with hypervigilance and being easily startled.

A 2022 follow-up of 82 veteran-dog teams found that more frequent use of cover was associated with lower PTSD severity but higher anxiety, a mixed result the authors couldn't explain with certainty. Both studies came from a single provider and relied heavily on self-report, so the findings are useful but limited.

Blocking vs guarding

The ADA regulation says the crime-deterrent effect of a dog's presence doesn't count as a task. Blocking qualifies because it is a trained positioning behavior that helps you manage disability-related symptoms, not because it keeps people away by intimidation.

A dog that growls, lunges or barks at people is not performing a task and may be out of control. Under the ADA, a business may ask you to remove a dog that is out of control when you don't take effective action, or one that isn't housebroken.

How dogs learn blocking

Trainers usually teach blocking with reward-based positioning. The dog learns to step to a target spot, such as across your front, and hold a calm stand or sit until released. Distance, duration and distractions are added gradually, starting at home before moving to quiet public spaces.

Cover is often taught by rewarding the dog for holding a position facing away from you, then shaping a gentle alert when a helper approaches. A qualified, positive-reinforcement trainer can keep the alert friendly and low-key. The American Veterinary Society of Animal Behavior recommends reward-based methods, and the 2022 veteran study found that daily use of dominance-based training was associated with worse PTSD and depression scores.

Training time varies by dog and handler, and no plan guarantees a particular outcome.

How to describe the blocking task

When staff ask what task your dog performs, you could say, “He's trained to create space around me in crowds because of my disability.” You don't need to explain the disability, show paperwork or have the dog demonstrate.

In your evaluation with a licensed clinician, explain what happens to you in crowded places, how it affects daily activities and how your dog's blocking or cover routine helps. The clinician decides whether a PSD letter is appropriate; a letter isn't needed for public access and is mainly used for housing.

Blocking limits and safety

Keep blocks short and don't obstruct aisles, doorways or emergency exits. A dog can't keep you physically safe, and if you feel threatened, move to a safe spot and call 911. Avoid placing your dog where it could be stepped on or startled.

Blocking supports treatment rather than replacing it. If distress in public comes with thoughts of self-harm, call or text 988, or call 911 in an emergency.