By Christine McCarthy(KUTV) Two-year-old Maggie is always at her owners side, even at Chris Carlsons favorite restaurant, Applebees in Layton.She's my best friend. We go everywhere together. Im divorced, Carlson said. She gives me purpose, and I get a lot of love from her, and she does the same to me. She just makes me feel good.Servers and managers have come to know the Boston Terrier service dog.They come in a couple times a week and they usually always sit at the same table, said general manager Pam Johnston.Maggie sits on her stool at their table for two. Trained last summer as a service dog, she helps Carlson, a Navy veteran of the Vietnam War, suffering from diabetes and Post Traumatic Stress Disorder.Shes trained to detect low blood sugar, so shell bark at me when I get low, said Carlson. And then the PTSD, I think just as a companion. Im not alone. I talk to her a lot.But, generally, Maggie doesnt make a sound.She just always sits there, waitress Kel Esplin said. Quiet, never barks. Nice dog. Maggie sits still beside Carlson while he eats his burger and fries, only occasionally offering her paw for a milk bone.She started getting sick and the vet said it was from the oil and the salt of the French fries. So I always carry a pocket full of milk bones, Carlson said, breaking a milk bone and handing her half.But Thursdays lunch was different. As Esplin walked through the door for her shift around noon, she heard commotion coming from Maggie.I knew something was wrong instantly, Esplin said.She started barking, and she jumped down, and I was horrified, because I thought she was misbehaving, Carlson said.But Maggie had noticed a diner in distress. She stood barking in front of a man who Esplin said was choking on a potato chip.He got up and he was choking and [his wife] was trying to give him the Heimlich, Esplin said, adding that the wife said she wasnt strong enough to help him. So she moved and I started giving him the Heimlich I put my hands together and hit his chest. I did it, like, four times.He coughed his food up and Maggie stopped barking, came back, sat down, and we finished up our meal, Carlson said.The mans wife thanked Maggie, Carlson said, and diners and staff congratulated her.There were people coming by and patting her, Carlson said.The incident was a first for Maggie, but not for Esplin, who helped a choking boy last week.I hit his back like three times and a mozzarella stick, the cheese, came up, Esplin said.Like almost everyone who saves a life, Esplin insisted she is not a hero.I'm just a waitress and a hairdresser, just a regular person, Esplin said.But Carlson was a little less modest about his buddys actions.Im proud of my friend, Carlson said, petting her head.(Copyright 2013 Sinclair Broadcasting Group)