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- Old Yeller (1957) (dog)
- Oliver & Company (1988) (cats and dogs)
- Once Upon a Forest
- Open Season (2006) (forest animals)
- Open Season 2 (2009) (forest animals and pets)
- Open Season 3 (2011) (forest animals, pets and circus animals)
- Operation Dumbo Drop
- Over the Hedge (2006) (forest animals)
Read more about this topic: List Of Films About Animals