In the close-up shot of Lip-Lip's eyes, you can see a corner of his mouth. When he says "Let's see what kind of a runner you are," to White Fang, his mouth is clearly not moving. See more
[Collie is barking and growling in complaint after sniffing White Fang
We're not getting jealous, are we?
Moi? Jealous at Monsieur Stinkbomb here? Please, don't insult my good breeding. I'm merely... curious.