Normally, I hate it when they have some annoying narrator talking to the Pink Panther. Thankfully, it doesn't happen frequently. However, in this one, it's okay because it's Paul Frees, not a name you probably would not know but certainly a familiar voice. It seems like I heard Frees' voice many times from the '50s through the '70s. The gentleman is still alive- and-kicking, too, in his mid '80s as I write this.
As another reviewer points out here, the "voice" is very devil-like in his message, stirring up neighbor against neighbor, whispering remarks in both the Panther's ear and his neighbor's, getting the two to square off against each other, all for selfish reasons.
There's lots of truth to this cartoon. We may not hear audible voices, but you know these kind of bad thoughts enter our heads from time to time, and some of them probably are from Satan. It's best to know where they come from, and ignore them!
The last minute of this cartoon is really hilarious as this neighborly feud escalates into literally an all-out war. The final message, delivered by the devil himself, will have you laughing right out loud.