You hear it before you see it: that rhythmic thump of a back paw against the floor, or the way your dog suddenly stops mid-walk to gnaw at a spot on their hip. Maybe you've caught a whiff of something musty coming from behind an ear, or noticed a patch of fur that looks wet even though your dog hasn't been near water. These moments are familiar to almost every dog owner once warm weather settles in, and they usually mean one thing: your dog's skin is trying to tell you something.
This guide walks through what that scratching, licking, and odor actually signal, what to do about it right away, and when it's time to bring in professional help. The Pet Hospital of La Mesa sees these cases constantly during the warmer months, and early recognition makes all the difference in how quickly your dog feels better.
When the Scratching Won't Stop: Recognizing the Moment
A dog who suddenly can't leave one spot alone is usually dealing with a hot spot, medically known as acute moist dermatitis. These lesions show up fast, sometimes within hours, as red, raw, oozing patches of skin. They tend to show up on the neck, the rump, the hips, or tucked behind the ears, spots your dog can easily reach with a paw or tongue.
The surface may look deceptively small at first glance, but hot spots spread quickly because the licking that caused them also keeps feeding them. Once your dog's skin barrier is broken, bacteria move in, and what started as a mild irritation can turn into a painful open wound within a day or two.
What's Actually Triggering That Itch
Several everyday culprits set off the scratch-lick cycle that leads to hot spots. Flea bites top the list, followed by underlying allergies, insect stings, moisture trapped beneath a thick coat after a swim or bath, and simple boredom-driven licking. Dogs with dense double coats, like golden retrievers, German shepherds, and Labrador retrievers, run a higher risk because moisture and heat get locked against the skin. Humidity plays a role too. While La Mesa doesn't see the heavy humidity of some regions, warm inland valley temperatures combined with coastal moisture drifting in from the Pacific can create just enough dampness in a dog's coat to set the stage for trouble, especially after a trip to Lake Murray or a backyard hose-down on a hot afternoon.
What To Do the Moment You Spot It
Act within the first day for the best outcome. Trim the fur surrounding the area so air can reach the skin, then clean it gently with a mild antiseptic made for dogs. Keep the spot dry, and put an e-collar on your dog if they keep going back to lick it, because that licking is exactly what keeps the wound from closing. Skip anything from your own medicine cabinet. Hydrogen peroxide and Neosporin are not appropriate for dog skin and can actually slow healing or irritate the area further. If you're unsure what product is safe, a quick call to your vet beats guessing.
When Home Care Isn't Cutting It
If the sore hasn't improved within 24 to 48 hours, or it's growing larger than a quarter coin, stop treating it at home and get your dog examined. A veterinarian at The Pet Hospital of La Mesa will look at the lesion, possibly run a skin test, and determine whether your dog needs oral antibiotics, a topical steroid, or a medicated spray to get things under control. Visible discomfort, spreading redness, or a dog that simply won't settle down are all signs that it's time to stop waiting and start treating.
The Allergy Behind the Scratch Cycle
Hot spots rarely happen in isolation. More often than not, they're the visible result of an allergy that's been building underneath the surface. Dog allergies generally fall into three camps: environmental triggers like pollen, grass, and mold; food sensitivities, usually tied to dairy, wheat, or certain proteins; and flea allergy dermatitis, which remains the single most common allergic trigger in dogs. Watch for persistent scratching, paw licking, ear scratching, smelly discharge from the skin or ears, red or watery eyes, visible rash, or patches of thinning fur. Environmental allergies tend to flare in spring and fall when pollen counts spike, while flea allergy dermatitis can erupt from a single bite in a sensitive dog. That's the reason year-round flea prevention matters so much for dogs living anywhere in California, not just during the warmer months. Food allergies show up least often of the three, but when they do, beef, chicken, dairy, and wheat are the most frequent offenders according to the American Animal Hospital Association.
Bacteria, Yeast, and the Secondary Infections That Follow
Broken skin invites trouble, and that's exactly what happens once chronic scratching wears down a dog's natural defenses. Two types of secondary infections commonly follow allergic itching:
- Bacterial infections (pyoderma): Red bumps, crusty patches, hair loss, and a noticeable odor usually point to Staphylococcus bacteria taking hold. Treatment typically involves oral and/or topical antibiotics.
- Yeast infections (Malassezia): Greasy or flaky skin with a musty smell, darker pigmentation, and relentless itching often signal a yeast overgrowth. These infections favor skin folds, ears, and paws, and respond to antifungal treatment, whether oral or applied directly to the skin.
Because these two conditions can look nearly identical from the outside, a skin cytology test is often the only way to tell them apart and treat them correctly. That lab step matters, since treating a yeast infection with antibiotics (or vice versa) wastes time your dog doesn't have while they're uncomfortable.
Reading the Seasons: What Southern California Dogs Deal With
Dogs living in and around La Mesa face a somewhat different allergy calendar than dogs in wetter or colder parts of the country. Dry grasses and wind-blown pollen dominate the late spring and summer months, while the mild winters here mean fleas rarely go dormant the way they do in colder climates. That means flea allergy dermatitis can be a year-round concern locally rather than a seasonal one. Dogs that spend time hiking in the foothills or playing in dry brush are also more prone to grass awns and foxtails working into the skin or ears, which can mimic or worsen an existing hot spot. If your dog has been exploring trails around the region, checking their coat and paws afterward is a smart habit.
Comfort Starts With Catching It Early
A small red patch caught on day one is a much easier problem to solve than a spreading infection on day five. The Pet Hospital of La Mesa is a veterinary clinic in La Mesa that treats hot spots, skin infections, and the allergies behind them, helping dogs throughout the area get back to comfortable, itch-free living. Most cases respond well once the right diagnosis is made, whether that means a short course of antibiotics, an antifungal rinse, or a longer-term allergy management plan. The key is not waiting out the first 48 hours if things are clearly getting worse.
Frequently Asked Questions
My dog just started shaking their head and scratching their ear, could that be related to a hot spot?
Yes, ear scratching and head shaking often accompany allergies or yeast infections, and the skin behind the ear is one of the most common hot spot locations because dogs can reach it so easily with a hind paw.
Is it normal for a hot spot to smell bad?
A noticeable odor usually means bacteria or yeast has already moved into the broken skin, so a smelly hot spot should be checked by a vet rather than treated with home remedies alone.
Can swimming in a lake or pool cause a hot spot?
Trapped moisture under a thick coat after swimming or bathing is a known trigger, so drying your dog thoroughly, especially around the neck and ears, helps lower the risk.
How fast can a hot spot get worse?
Hot spots can grow noticeably within a matter of hours because the licking that caused the lesion keeps irritating it further, which is why early intervention matters so much.
Are some dogs just more prone to developing hot spots than others?
Dogs with thick double coats, like golden retrievers, German shepherds, and Labrador retrievers, tend to develop hot spots more often because moisture and heat get trapped close to the skin.
If your dog is dealing with a red, raw patch, relentless scratching, or a smell you can't quite place, don't wait for it to resolve on its own. Contact the team at The Pet Hospital of La Mesa to schedule a skin exam, and ask about their parasite prevention and wellness care services to help keep these flare-ups from coming back.
Book an Appointment or call us at (619) 469-0138.