Chicken animation should be just fine. You're using the default CS:GO chicken model, just like I have setup with my Chicken Mod plugin.
Is the animation not working for this plugin GabenNewell? Have you tested it yourself?
The only thing I didn't see was a model precache:
Also, you'll definitely need this if people use a custom model, unless you tell them to use a seperate plugin for precaching and adding to download tables.
Take a look at my plugin for examples and what not - if you want.