Does anyone know this sad cartoon/CGI/animated film, based around animals?

It is not Plague Dogs btw
These are the things I remember from this film/short that was shown on one of the kid channels (I think CN) when I was younger.

- It had some odd CGI effects
- It was a very dark and sinister film
- I THINK it was about animals trying to rescue other animals at this factory where these evil people worked at
- The animals were shipped in trucks
- The main villain was female
- There was this room with green tiles and when someone pushes a button in this control room the tiles would fly off and the person inside would fall to their doom
- At the end, the animals trapped the bad guys in the room and pushed the button, dropping them to their death
- I think the animals were experimented on

That's all I know/remember about this film. Do any of you know this? I really want to see it again.
 
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