The lettering is cream, all caps, stacked: I GOT THAT DOG above, IN ME below. Between the two lines, a small tan chihuahua stands in red boxing gloves, front paws up in a guard that would not stop a determined housecat. Behind him, cast against a brick wall, is the shadow of a wolf. Not a second dog. A shadow — black, much larger than the animal casting it, with a long muzzle and pointed ears that belong to no chihuahua ever whelped.

The joke is entirely in the scale. The boast is the lettering; the evidence is the dog; the shadow is what the boast is asking you to believe. You are meant to read all three at once and understand that the gap between the dog and the shadow is the point. The shirt does not say the chihuahua is a wolf. It says the chihuahua has a wolf in him, and then it draws the wolf as a shadow, which is the only place a wolf that size could fit.

I keep coming back to the brick wall. It is a plain backdrop, the kind of thing you see behind a fighter in a promotional photo, and it does the work of making the chihuahua look like he is in a ring or a alley or a gym. The red gloves are the only saturated color in the design besides the tan of the dog. The rest is cream and black and brick. It is a disciplined little composition, and it earns the joke instead of just shouting it.

What interests me is not the meme. The phrase I got that dog in me has been around long enough that it has lost most of its edge, and I am not going to pretend to know where it started or who said it first. What interests me is the specific solution this artwork finds to a problem the phrase creates. The phrase is a claim about hidden capacity. It says: there is something in me that you would not guess from looking. The problem is that a claim about hidden capacity is hard to draw. You can draw the capacity — a wolf — but then you have drawn a wolf, and the hiddenness is gone. You can draw the animal as it appears — a chihuahua — but then the claim is just a boast with no evidence. The shadow is the compromise. It is visible and invisible at once. It is the shape of the thing without the thing.

That is a fairly old visual trick, and I do not mean that as a criticism. The shadow as the true self is a convention you see in everything from pulp covers to tattoo flash. What makes this shirt work is that it applies the convention to a dog that is almost comically unsuited to it. A chihuahua is small, loud, and built like a wind-up toy with a grudge. It is not a wolf. It is not even close. And yet the shadow is there, and the shadow is enormous, and the chihuahua is standing in front of it with his gloves up like he intends to do something about it.

The humor is not that the chihuahua is secretly a wolf. The humor is that the chihuahua believes he is, and the shirt has decided to draw his belief rather than correct it. The shadow is not a fact about the dog. It is a fact about the dog’s self-image. That is a more interesting thing to put on a shirt than a straight boast, because it lets the wearer in on the joke without requiring them to pretend they are actually dangerous. You can wear this shirt if you are a large man who works with his hands, and you can wear it if you are a small person who has been underestimated, and you can wear it if you are neither and just like the drawing. The shadow does the work of making the claim ironic enough to be safe.

I have spent a lot of time around people who do physical work, and one of the things I have noticed is that the language of toughness is almost always comic. The biggest man in the shop is usually the one making the smallest jokes about himself. The guy who can actually lift the thing is the one who says I got that dog in me with a straight face and then laughs first. The shirt fits that register. It is a boast that has already undercut itself, which is the only kind of boast that survives contact with a crew.

The design also solves a problem of scale that a lot of novelty shirts get wrong. If you print a small dog large, you lose the smallness. If you print a large dog small, you lose the largeness. Here the small dog stays small and the large thing stays a shadow, so both sizes are preserved. The chihuahua is drawn at roughly the size a chihuahua would be relative to the lettering, and the wolf is drawn at the size a wolf would be relative to the wall. The eye reads the contrast immediately, before it reads the words. That is good graphic design, and it is not as common as it should be.

The shirt is sold by Quirky Cotton Collective, and you can find it here. I am not going to tell you it will make you tougher or that it is the perfect gift for the dog person in your life. It is a shirt with a drawing on it, and the drawing is better than it had to be. The chihuahua in the red gloves is a specific character, not a generic mascot, and the wolf shadow is a specific idea, not a generic background. That is worth something.

What I keep thinking about is the moment the shadow gets cast. In the drawing, the light source is implied but not shown. The chihuahua is facing us, gloves up, and the shadow is behind him, which means the light is coming from somewhere in front of him, somewhere off the edge of the shirt. That is the viewer’s position. We are the light. We are the thing casting the shadow. The shirt is not just saying the dog has a wolf in him. It is saying that we are the ones who see it. That is a small, neat trick, and it is the kind of thing that makes a piece of commercial art worth looking at twice.

Editorial note: This publication and Quirky Cotton Collective share an owner.