Candybooru

lol, Mike's tiny.

"He's this small"

Actually, she's pointing how much longer Mike is, so Paulo's the one with the tiny dick.

/jokeexplained

^They could both have huge dicks with Mike being slightly larger.

Just something that dug it's way into my brain and is leeching away what little common sense I have left.

In our universe (th one where animals are not yet capable of bipedal movement and reasoning and language and such), we already compete over many things like athletic ability, penile length, intelligence, and such.
The webcomic partially reflects our tendencies and nature as much as it dramatizes everyday life. Cats have tails, so maybe the joke is far less sexual than we perceive it to be.

But that's retarded. It's far less funny that way.

love his face after she shows him

"How much bigger is Mike?!" A better, more appropriate line would've been "How big is Mike?!" Him saying "how much bigger" implies that Mike's size is the same as Paulo's plus slightly more (because of Lucy's apparent measurement). That, or I'm over-thinking the fuck out of this, which I do sometimes.

I thought she was reminding him that she can't hear (well) out of that ear, so she didn't hear what he asked.

I mean that is a pretty long scarf.