The defenseman stopped to pose with his boxer and french bulldog for a few photos. One snapshot would be chosen and featured for the month of April in the Bruins' 2014 Pucks & Pups Calendar.
"I mean, it was so easy - take your dog for a walk and get a picture taken basically and it's for a great cause, so that's even better," said a smiling Seidenberg.
The blueliner joined his teammates and Bruins' management in posing with family pets or new friends waiting for homes for the calendar. The initiative raised $30,000 for MSPCA-Angell's adoption services program, which cares for homeless animals awaiting adoption.
On June 5, Seidenberg visited the center in Boston to present the $30,000 check on behalf of the Boston Bruins Foundation.
It marked one of the largest single donations to the MSPCA's adoption centers this year.
"All of the guys are happy to be able to help out in that way and hopefully it goes a long way," said Seidenberg.
The Boston faithful have stood by their team on the ice, and also out in the community.
"It's huge for the Bruins fans to donate that much money. In general, the fans like donating, like you saw with Beard-A-Thon, they by far donate the most, so it's nice to see our fanbase really active in the community and helping out places like MSPCA," he said.
"The animals are beautiful here and they all need homes. If you see all of the animals in here, they're well taken care of, but they're all looking for homes and it's a great cause the Bruins and Foundation are involved in, and it was nice to come here and see all of the animals."
The MSPCA-Angell is a national and international leader in animal protection and veterinary medicine and provides direct hands-on care for thousands of animals each year. Founded in 1868, it is the second-oldest humane society in the United States.
When Seidenberg entered the adoption center, he was immediately greeted by a lively puppy named Teddy. The staff took him on a tour of the expansive facility to see all of the animals, and a chorus of barking commenced as Seidenberg made the rounds.
Teddy and countless other dogs, cats, bunnies and even parrots are all awaiting homes at the MSCPA (for information on adoption, head to mspca.org).
"I can't believe what a large facility it is, and how many different animals that they treat, so it's always good to see where your money goes and it's going to a great organization and helping out so many different animals," said Bob Sweeney, Executive Director of the Boston Bruins Foundation.
All of the funds raised will go directly towards caring for the animals to help them find homes.
"It was a great initiative, and all the players were good sports to have their photos taken," said Sweeney.
Players like Seidenberg, Johnny Boychuk, Jarome Iginla, Daniel Paille and Shawn Thornton all posed with their own pups, along with General Manager Peter Chiarelli and Head Coach Claude Julien. Milan Lucic and other Bruins players and staff were pictured with puppies from the MSPCA (watch a video of the photoshoot here.)
On that day back in October, Seidenberg took his boxer Wiggles and his french bulldog Bubbles Lollipop for a walk (his wife named the former 10 years ago, because he likes to wiggle his tail; his daughters named the latter, because it was easier for them to pronounce than the first name suggestion of 'Blueberry').
It was a simple, small gesture by him and the Bruins - but the impact turned out much greater than anyone could expect.
"As you know, we have a lot of dog lovers on our team and guys who have dogs, so I think it worked out, it was a great fit, and we were extremely happy with the results," said Sweeney.
"We thank everybody that purchased the calendars and as they can see, it's going to a great cause."