By Sharon L. Peters, Special for USA TODAY
DENVER — Most of the time, Biscuit the bulldog is just a regular stubby-legged young dude who runs around the yard collecting sticks and making everyone laugh with his goofy antics.

But each Friday, once he dons his green work vest, he adjusts his jowly mug into an expression of genial concern, discards all thoughts of canine capers and calmly sets about the business of cheering up stroke patients or encouraging children in their classrooms.

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"This is his calling," says his owner, Shannon Pryor, 28, of Wheat Ridge. She recognized Biscuit's highly empathetic nature when he was a wee pup and she was convalescing with a broken foot.

Pryor got herself and Biscuit registered as a pet therapy team through Denver Pet Partners when he was 1 year old, and now they spend Friday mornings at either the Easter Seals stroke rehabilitation center or at Pine Grove Elementary School.
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