In this Thursday, Jan. 31, 2013 photo, Dinky, the tiny pure bred rat terrier pet of Melissa Duffy, attacks the toy known as "Kong," which releases treats when tilted the right way in Carlsbad, Calif. "She starts to get anxious when I am getting ready to go out, whining, pacing, shivering," Duffy says. Being left with a food-dispensing toy calms her reaction to Duffy's departure and has longer-lasting effects as well. (AP Photo/Lenny Ignelzi)

Associated Press
In this Thursday, Jan. 31, 2013 photo, Dinky, the tiny pure bred rat terrier pet of Melissa Duffy, attacks the toy known as "Kong," which releases treats when tilted the right way in Carlsbad, Calif.  "She starts to get anxious when I am getting ready to go out, whining, pacing, shivering," Duffy says. Being left with a food-dispensing toy calms her reaction to Duffy's departure and has longer-lasting effects as well. (AP Photo/Lenny Ignelzi)
In this Thursday, Jan. 31, 2013 photo, Dinky, the tiny pure bred rat terrier pet of Melissa Duffy, attacks the toy known as "Kong," which releases treats when tilted the right way in Carlsbad, Calif. "She starts to get anxious when I am getting ready to go out, whining, pacing, shivering," Duffy says. Being left with a food-dispensing toy calms her reaction to Duffy's departure and has longer-lasting effects as well. (AP Photo/Lenny Ignelzi)
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