THORNTON, Colo. (CBS4) – A pet store owner who had puppies stolen from her store last week is now offering up to $2,000 to anyone who helps get them back safely.

Last week thieves stole four English bulldogs from a Pet Ranch in Thornton and nine other puppies from Puppies N Stuff in Northglenn. Investigators are still looking into whether the crimes, which happened within 30 minutes of each other, are connected.

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Two of the dogs in the Northglenn robbery were later found abandoned in a bush in freezing temperatures. A family discovered them in their front yard near Wadsworth Boulevard and Yale Avenue and took them to the Foothills Animal Shelter.

Renee Reese, who owns the Pet Ranch, told CBS4 she’s worried about the health of all of the animals that are still missing.

“It’s heartbreaking. We don’t know if they are okay. It’s freezing cold temperatures out there,” she said. “I’m worried we’re going to run out of time.”

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Reese says in order to rob her store the thieves broke in, busted through a locked cage and grabbed the bulldogs. Surveillance video showed two men carrying the animals out in a plastic trash can.

(credit: CBS)

(credit: CBS)

“We need their help. We need everybody’s help in finding these puppies and getting them back safely,” she said.

The bulldog puppies are valued at $11,000.

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Anyone who has information about the case that might be helpful to police is asked to call Thornton police or Pet Ranch directly at (303) 452-2050.