OH that was a harsh ending. I thought the cat would simply reject the cat food after all that effort at the end.
Reminds me of a little cat I knew once. Though she had other food available, she ate through a foil-lined plastic bag (the BOTTOM of the bag too) to get to the cat food she liked more. Even though they were both dry food.
But it's a beautiful animation anyway. I don't think the ending quite fits, my idea for the punchline would have been better I think.