The dog is the only one looking at the camera
In most family photographs the animal is the only subject making eye contact, because it is the only one who does not know it is being photographed.

Four people on a sofa, arranged for the picture, none of them looking at it. A dog sits in front of them, staring straight down the lens.
Everybody in the frame was told where to look. The dog wasn't, and got it right anyway.
Why does this happen in almost every family photograph?
Because the dog is the only one who doesn't know a photograph is being taken.
Everyone on the sofa has been asked to hold still and look somewhere in particular, which means they're performing "looking at the camera" rather than actually doing it, and performed eye contact drifts — a glance at the kid next to them, a half-turn, a blink at the wrong second. The dog has no idea what a camera is. It's simply watching the person holding the interesting rectangular object, which happens to be pointed at it, which happens to be exactly where the lens is.
Why does the composition still work?
Because the accidental focal point is doing the job on purpose.
A viewer's eye goes to whatever is looking back, every time, and a photograph with one confident gaze in an otherwise scattered frame reads as composed even when nobody arranged it. The four people are the subject the photographer meant to record; the dog is the one thing in the picture actually performing the function a portrait is supposed to perform.
Does the same thing happen with cats?
Less reliably, and for the opposite reason.
A cat that's interested in the camera looks at it exactly as directly as a dog does, but a cat that isn't interested leaves the frame or turns its back, so the ones that survive as photographs already skew toward the animal that was paying attention. A dog tends to hold its spot near whoever's giving directions, which is why it ends up in frame at all.
What if the photo is from after the animal died?
The picture doesn't change; what the room does when they see it does.
A design pulled from a photograph like this — the sofa, the four people, the one animal looking at the lens — is the same print whether the dog is still around or not. What shifts is the reader: after a loss, the one figure making eye contact becomes the whole reason the photograph gets looked at twice. Nothing about the artwork needs to say that for it to be true. The same idea, approached from the animal's side rather than the family's, is what happens when two pets who never overlapped end up in one design.
Does it matter which pet is in it?
Only in the sense that a specific animal reads as specific, the same as a specific person does.
A named dog with a known coat pattern and a known way of sitting is a portrait, not a generic pet shape. The same rule applies here as with any face pulled from a photograph: detail is what makes it somebody's, not a category.
Can the people be cropped out and just the dog kept?
It can be done, but it changes what the design is about.
Cropped tight, it becomes a portrait of the animal. Left as the original arrangement — people composed, dog staring — it's a photograph about the difference between the two, which is the more interesting version and the one this whole idea depends on. For advice on cropping and supplying the file itself, see preparing a pet photograph for a shirt.
Whose photograph is this?
Only use one you or your family actually took.
The rule is the same as for any family snapshot: it has to be yours, or given to you by whoever took it, sofa, dog and all four people included.
Does it print well?
Yes, and the contrast between the two kinds of gaze is the thing worth protecting.
A faded colour snapshot like this keeps its warmth on fabric if the palette stays close to the original — oatmeal, sand or a soft warm grey garment, with the print itself limited to the tones actually present rather than pushed toward full saturation. The dog's eyes are the one place in the image that needs to stay sharp; everything else can soften a little and the picture still reads.
How do I get one made?
Describe the photograph at JustOG — who's in it, which animal, and whether to keep the full group or crop toward the one that's looking back. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
Four people looking at four different things, and a dog looking at exactly one.