Yep---perfectly and succinctly described, Tarks.
I used to do a little test when I wrote scripts featuring animals. Would this be funny if a human was saying this line? This is why the snake has virtually disappeared from Horace. In my opinion, it had ceased to work. I've explained before about the original concept of introducing the snake. It was, simply, a way of adding visual variety and, in a Western strip, what better creature than a rattlesnake? I then realised that every cartoon snake I'd ever seen ssssspoke like thisssss so I thought it might be amusing to have a snake who couldn't pronounce the letter "s". While I think it initially worked, it was becoming increasingly contrived.
Of the animals that I write about, I think the vultures in Beau Peep work best. This is a basic father/son thing where, I hope, the dialogue stands up on its own. Well, that's the aim,anyway.