Why is there pus coming from my dog's ear?

Pus oozing from your dog’s ear is never a good sign. That thick, sometimes yellow or greenish discharge often signals something’s wrong—maybe an infection, maybe irritation, but definitely not something to ignore. Let’s break down what might be going on, and why acting fast matters, especially if you’re in areas with strict pet health regulations.

Ear infections are the usual suspects. Bacteria or yeast love warm, moist places, and a dog’s ear canal fits the bill perfectly. Breeds with floppy ears, like Cocker Spaniels or Basset Hounds, are more prone—their ears trap moisture after a swim or bath. You might notice your dog scratching at their ear, shaking their head a lot, or even avoiding having that ear touched. These are all red flags that shouldn’t be brushed off.

Another possibility? Foreign objects. Dogs love sticking their noses (and ears) into places they shouldn’t. A grass awn, a tiny twig, or even dirt can get trapped in the ear canal, leading to irritation, infection, and eventually pus. If you suspect something’s stuck, resist the urge to dig around with cotton swabs—you could push it deeper or damage the eardrum. This is where a vet’s expertise becomes crucial.

It’s important to remember that in many European and American regions, neglecting a pet’s health can have legal consequences. Laws vary by state or country, but failing to provide necessary veterinary care is often considered animal cruelty. So, beyond the obvious care for your dog, getting that ear checked isn’t just responsible—it’s legally smart too.

When you take your dog to the vet, they’ll likely examine the ear with an otoscope to look for signs of infection, foreign objects, or even mites. Treatment might involve cleaning the ear, prescribed ear drops, or in some cases, oral antibiotics. Follow-up care is key—skipping doses or stopping treatment early can let the problem come back, worse than before.

Prevention goes a long way. If your dog loves water, dry their ears thoroughly after swimming or bathing. Regular ear checks—once a week or so—can help catch issues before they turn into pus-producing problems. Look for redness, swelling, or a bad smell—these are early warning signs.

Your dog can’t tell you when their ear hurts, but their behavior will. Excessive scratching, head shaking, or sensitivity around the ear are cries for help. Don’t wait for pus to make it obvious. A quick trip to the vet can save your dog discomfort, prevent complications, and keep you on the right side of the law. After all, a healthy, happy dog is what being a responsible pet owner is all about.