Or even a Furby!
Anyone who thinks animation has to be hyper-realistic in order to be emotionally connective never cried watching Bambi. Conversely, the more realistic an animation is, unless it is indistinguishable from real life, the creepier it is, even if it’s supposed to be happy. At best, you can achieve a creepy sort of happy. Usually, that becomes a “fail.”
The Polar Express, for example. Creepy.
The term used to describe the acceptability of such things is the Uncanny Valley, which would also be a great band name.