When Stumpy gets amnesia and meets the rest of the main four, whom he has forgotten, he acts friendly and polite instead of being a rude brat. Why? When he forgot the others, he also forgot the years of abuse they gave him, which gave him a Freudian Excuse and was the reason he was so bitter all the time.
We are treated to the lovely revelation that Mr. Cat is so desperate to maintain a good image in Kaeloo's eyes that would be willing to brutally murder Stumpy with a chainsaw to prevent the squirrel from making him look bad in front of her.
How does Mr. Cat know what Stumpy's mother looks like naked?