The movie delivered exactly what it promised: laughs. It's not earth shattering, mind blowing, and it doesn't explain the meaning of life in 90 minutes. But it's not that type of movie. It's a summer escape film, one that is a little different from the 1000th superhero movie or Sequel #10 of The Current Film of Mediocrity, and one that you can bring your children to without worrying about covering their eyes and ears every scene. There are a couple of scenes of mild violence or almost violence, but they aren't any worse than Bugs Bunny and his adventures with the Roadrunner (I suppose that reference dates me lol).
What I liked the best about the movie is the way it demonstrates the thoughts and behaviors of the pets to the viewer. As a Great Dane owner, I often wonder what my dogs are thinking/doing, especially when I'm at work, and my ideas are similar to the writers. Their thoughts and conversations were the funniest parts of the film, and the scenes and soundtrack combined with the dialogue to form a lighthearted, enjoyable story.