Those are Greenland huskies (some know them as Inuit dogs), maybe a couple MacKenzies in there, those dogs have been bred in those areas for generations and are quite used to wild polars and arctic fox and such, still neat video. If those dogs had been hurt by the bears in any way I guarantee there would have been some blood shed on both sides, Greenlands are not known for their mild temperaments.
They sure look like little pups next to these bears

, the paws on them are humongous, it's just amazing.