What Causes Bladder Infections in Dogs?

This question comes up pretty much EVERY time a dog comes in with a bladder infection, and I get it. People want cause and effect. I ate a bad dinner, now my stomach hurts. Makes sense. We’re wired to connect the thing that happened to the thing that came before it.

And when it’s your dog, the question underneath the question is usually: did I do something wrong? Am I a good dog parent?

So let me answer the question you DIDN’T ask first. No. You did nothing to cause your dog’s bladder infection. You’re a good dog mom. Thank you for bringing her in to Leo’s Pet Care so we could treat the problem.

That’s the whole answer, if that’s all you wanted. You don’t have to be an expert in everything dog. That’s what we’re here for.

But if you want the rest of it, I have to warn you — it gets gross. Maybe a lot gross. You might not actually want to know. If the paragraph above was enough, you’re free to go.

Still here? Okay. Let’s do some science.

How do I know if my dog has a bladder infection?

Before the gross part, the practical part — because this is usually what people are actually typing into Google at 11pm. The common signs of a dog bladder infection: peeing more often than usual, straining or squatting over and over with little coming out, blood in the urine, accidents in the house from a dog who’s normally clean, and licking at the back end. If you’re seeing those, that’s a reason to come in.

Why do female dogs get more bladder infections?

Female dogs get bladder infections because of a design quirk. They have a short urethra, and it sits right below the anus.

So first, a quick lesson about poop. Poop is mostly bacteria. There’s some undigestible food in there, some leftover waste from bile, but the bulk of it is bacteria.

Now picture poop coming out of your dog. That’s basically a solid ball of E. coli, and guess what it passes on the way down? The urethra.

Yes, she “wipes” afterward with her tongue. But do you really think that’s getting her clean? This is the same tongue that licks her feet after a walk outside. She doesn’t brush between wipes. Her mouth is full of bacteria too.

I told you not to read this.

It gets worse if she has diarrhea. Harder for her to clean up, and some of it can end up on the tail, which then swings right past the urethra.

So when she tries to clean the poop off, she’s actually smearing E. coli from the poop and Staph from her skin all over the area. It’s honestly no surprise some of it works its way into the urethra now and then.

That’s your bladder infection.

Why is my dog licking down there?

Now here’s something I left out for years, and it matters. Sometimes the licking isn’t about cleaning up at all. Sometimes she’s licking down there because she’s itchy — and a lot of the time, that itch is allergies. Allergic dogs lick. They lick their feet, their belly, their back end, whatever itches. And all that extra licking around the urethra moves even more bacteria into a spot you really don’t want it. So if your dog is licking herself a lot, that’s worth mentioning to me. We might be treating a bladder infection AND chasing down an allergy that’s making the whole thing more likely to come back.

And sometimes the licking is pointing at the vulva itself. Some female dogs have a conformation issue — extra skin folds around the vulva, or a vulva that sits tucked in — and that traps moisture and bacteria right at the doorstep. Some have inflammation or other changes down there that need a real look. The point is, if she keeps licking that area, don’t just write it off as her being a dog. Bring her in. Sometimes what looks like a simple bladder infection is sitting on top of something else, and treating only the infection means we’ll be seeing each other again in a couple months.

Do male dogs get bladder infections?

Oh — you have a MALE dog? They get UTI too, just way less often. The opening is nowhere near the anus, and the urethra runs all the way from the tip of the prepuce up to the bladder. Long trip. Hard for bacteria to make it that far.

One thing to take seriously with males, though: if your male dog is straining to pee and nothing is coming out, that’s not a wait-until-morning situation. A dog who truly can’t pee is an emergency. Get him seen right away.

Now you know.

When should I bring my dog in?

Short version: if your dog is straining to pee, peeing blood, having accidents, or licking herself raw, come see us.

ONE IMPORTANT THING: I said bladder infections are mostly E. coli or Staph. That’s a big oversimplification. There are tons of different bacteria living in poop and on skin, and each one responds best to a different antibiotic. That’s why your veterinarian has to pull a urine sample with a STERILE NEEDLE AND SYRINGE and send it to the lab to grow a culture and find out exactly which bug we’re dealing with.

Yes, it costs you money. It costs me money too — lab fees aren’t cheap. But it’s worth it. It’s the fastest way to the CORRECT answer and the right treatment, instead of me guessing at the bacteria and grabbing an antibiotic off the shelf and hoping.

So when your dog gets a bladder infection, come see us at Leo’s Pet Care here in Indianapolis. We’ll get her fixed up.