According to Purdue's Alan Beck, what is the biggest reason a dog barks at one person and not another?

Something about the person is new or unfamiliar

Which of these can make it harder for a dog to recognize someone it knows?

A hat or other object on the head

Dogs on a tight leash were much more reactive than dogs on a loose leash

The driver leaves, so the dog thinks the barking worked

Desensitization and counterconditioning

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According to Purdue's Alan Beck, what is the biggest reason a dog barks at one person and not another?

Caution around the unfamiliar is a safety strategy for a dog.
Which of these can make it harder for a dog to recognize someone it knows?

Sunglasses, masks and bulky coats can do the same.
Scott and Fuller's research put the puppy socialization window at roughly what age?

Puppies that meet many kinds of people then are less likely to fear people later.
Which human behavior looks threatening to a dog?

Nervous people often stare, which makes things worse.
How accurate were trained dogs at picking out stressed breath and sweat samples in the 2022 Belfast study?

A tense visitor may smell different from a relaxed one.
What did a 2026 Swedish study find about leashes?

Holding the leash short and stiff can create the barking you want to avoid.
Why do dogs bark more at delivery drivers every day?

The habit gets stronger each time.
What do trainers call changing how a dog feels about a trigger with distance and treats?

People in hats can come to predict chicken.