Most of the night scenes were shot during the day. At night, dogs tend to go to sleep wherever possible.
The electronic press kit for the film sent to media included a video showing an increasingly irate Mr. Tinkles screentesting unsuccessfully for several famous movie roles. These scenes can be found on the special features on the DVD.
In a number of scenes a puppeteer was used and then digitally erased.
Robert Rodriguez turned down the opportunity to work on this film, in order to continue work on the Spy Kids franchise.
Prada, the Beagle who played Lou, also played Porthos in Star Trek: Enterprise (2001).