Look, the best joke in the first Secret Life of Pets is that if you do the trendy thing of acronym-ing it's title, it becomes SLoP, which is funny because it's true.
Honestly, I can't even say I remember the first movie very well. I did see it. I mostly recall that I didn't really like it that much. So, as you can probably deduce, I wasn't entirely looking forward to the sequel. The trailers also prominently featured coprophagia, so that wasn't helping anything.
But about those trailers— if you take out the inter-titles and the music, you just watched that scene in the movie. That's exactly how it's cut in the movie. All of the trailers are like that. They're just scenes from the movie. The movie is cut like a trailer.
And the weirdest thing about this movie is that, somehow, despite being just scenes from the movie, this is a case of bad trailers being way worse than the actual movie. This is a very weird movie.
