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I'll say this plainly, because the internet will try to talk you into something foolish: that red lump in the corner of your dog's eye is not an emergency, but it is a phone call to your vet, and the sooner the better, before it becomes the kind of problem that costs more than it should. I learned this from a terrier named Kevin, who developed the most theatrical eye I have ever seen on a Tuesday that was otherwise perfectly ordinary.
Here is what it looks like, because the first time you see it you will think something exploded. In the inner corner of the eye, nearest the nose, a small reddish swollen gland pops out and sits there like a button someone sewed on wrong. It's the third eyelid's gland, the one that normally tucks away out of sight and helps make tears. In some dogs, the little ligament that holds it down is just loose, and one day it lets go. Kevin's appeared while he was napping on the couch, and when he woke up he looked like he'd been in a fight he couldn't remember.
My opinion, and I'll stand by it, is that people panic too hard at the sight and then wait too long to act, which is the worst of both. The gland itself isn't a crisis. Your dog isn't dying in the corner of his own eye. But that gland makes a meaningful share of the eye's tears, and if it stays out and dries and scars, the eye can end up dry and irritated for the rest of his life, and that is a slower, meaner problem than the one you started with.
The fix is a vet's job, and the good news is it's usually a straightforward one. The old way was to remove the gland entirely, and some clinics still do, but the better approach now is to tuck it back where it belongs and stitch the pocket closed so it stays put. Kevin had the tuck. He came home with a cone that made him bang into doorframes for a week, and a month later the corner of his eye was clean and unremarkable, exactly the way you want an eye corner to be.
What you should not do is try to push it back in yourself and call it handled. It'll go back, sure, and then it'll come out again tomorrow, because the ligament is still loose and you haven't fixed the thing that matters. You also shouldn't ignore it hoping it retreats on its own, because glands are not known for volunteering to return to their posts. The middle path is the boring one: see the vet, book the tuck, keep the cone on longer than feels fair.
There's a breed thread worth knowing. Bulldogs, terriers, spaniels, and a few of the flat-faced and loose-skinned kinds run into this more than others, often when they're young, sometimes before their first birthday. If your puppy is one of those and you spot the red button, don't wait for it to get bigger. Small and early is an easier fix than large and angry.
The aftercare is where owners trip up, and I've watched it happen. Kevin's cone came off the moment his owner felt sorry for him, and the gland popped back out within two days, because the stitch needs a full week of quiet to hold. The second time she kept it on, grumbling and guilty, and it stuck. The lesson is dull but true: the boring part of the instructions is the part that decides whether you pay once or twice, and the savings of skipping it are imaginary.
A bulldog I knew got it at seven months, both eyes within a month of each other, which the vet said happens more than you'd think in the loose-skinned breeds. His owner caught the second one the morning it appeared and was at the clinic before lunch, and the vet said that early catch is exactly why the tuck went so clean. Waiting, she told him, is what turns a twenty-minute fix into a chronic dry eye you manage forever with drops and worry.
If you're the kind of person who likes to know early, watch the inner corner the way you'd watch a toddler with a marker: closely, and with low trust. Any redness, any bump, any wetness that wasn't there yesterday, earns a look from the vet. It's rarely the scary version. It's also rarely nothing, and the gap between those two is exactly what the examination is for, not a guess from someone who has never met your dog.
If the eye is suddenly red, swollen, and your dog is pawing at it and squinting hard, that's a different and more urgent story, and you go in the same day. But the garden-variety cherry eye, the one that looks worse than it feels, still earns a prompt appointment, because the person who decides between a simple tuck and a lifetime of dry-eye drops is your veterinarian, and you want them seeing it while it's still simple.