There are three plot lines in the Secret Life of Pets 2. One featuring Max the dog, another with the focus on Snowball (a bunny), and the last one centered around Gidget (another dog). Perhaps the movie would have been slightly better if it focused on only two of these.
The film did have some laughs but not nearly enough. I did not find it very interesting and a one point during the movie I decided to "rest my eyes" as my dad would say.