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Ms Jacobsen said Harry, a 9-year-old lhasa apso-bichon cross, was the agency's "flagship dog" who features on the company's website and has gone to work with her since he was 2 months old.
Jed, a bichon-shih tzu cross, now 11 months old, has also been warming the office couch or his bed under Ms Jacobsen's desk for the past nine months.
Ziggy, a Japanese spitz, is a recent arrival - her owner started work at the agency about two weeks ago.
"They're a bit of an ice-breaker and people love them, which is good because we get a lot of people who come in who are very nervous. But if they see the dogs, then the dogs relax them because they want a pat or a cuddle," Ms Jacobsen said.
"They hate couriers, though. They always bark at the couriers. They know a courier as opposed to a visitor."
Ms Jacobsen recommends others try taking their canines to work, where possible.
"They're very quiet and they calm the office a lot - they are a good influence," she said
Research shows that having a canine companion in the workplace can reduce a person's stress levels by 11 per cent by the end of a typical work day. The research found that dogs can also help to reduce heart rates, blood pressure and cortisol levels.
Pet care adviser and dog behaviour expert Scot Marchant-Ludlow said taking dogs to work also encouraged exercise for their owners.
He advised introducing dogs to their co-workers and other pooches that may be in the work place. "You just want to make sure they all get on okay."