It's bloated: a lot of time is spent on slow-motion scenes of the dogs and people running through emblematic national scenery or joyfully burrowing/tug-of-warring/staying-then-fetching (dogs only, usually). For the most part, it is intensely boring.
If all you want out of The Pack is to see lots of adorable dogs make their way through various world locales, complete with spectacular photography, then it's worth a watch.