Computer-animated children's comedy following the adventures had by a group of New York pets after their owners leave the house.
Pampered terrier Max (voice of Louis C.K.) is shocked when his owner brings home a huge, sloppy mongrel named Duke (Eric Stonestreet) from the dog pound.
An intense rivalry quickly sparks between the two pets, with a jealous Max desperate to regain the attention he once had.
However, the duo must put their differences to one side when cunning rabbit Snowball (Kevin Hart) begins to build an army of neglected ex-pets intent on getting revenge on all happily-owned pets and their owners.
With the help of the other animals in his Manhattan building, Max must put a stop to Snowball's evil schemes before it's too late.
The film also includes the voice talents of Steve Coogan, Jenny Slate and Lake Bell.