Is it possible to add a sprite animation in Load.js in preload()?

[PhantomQuest]

I wanted to know if it's possible to load an animated sprite in preload() and use it in preload(). Essentially I am trying to get an animal to run across the screen to mark the progression of loading. I have a simple graphic rectangle setup as a basic loading bar right now. If I try to update the position of the sprite with this.dog.x it throws an error that x is not a property.