Abandonment is a major theme throughout movie it may be triggering for people who went through that.
!! SPOILERS !!
By the end of the movie Petey learns how to be a father to lil Petey and heal from his own trauma from his father abandoning him. This would be a good movie to explain this issue to young children.
Petey becomes a villain and abandoned his son after his father abandoned him. It’s a better handling of generational trauma than most kids movies, though, as Petey’s father isn’t absolved of it.
Dog Man is sad while daydreaming about happier times when he was simply a dog before he was hurt by a bomb. A cat talks about how he was abandoned by his father and was and left to wander the streets alone.