Best Medicated Dog Shampoo (NZ)

If your dog is scratching, licking or smelling a bit funky, a medicated shampoo can make a real difference — but only if you pick the right one for the actual problem. Here's the short answer: for yeasty or bacterial itchy skin, Malaseb is the top all-rounder. For general itch, sensitive skin and allergy maintenance, gentle oatmeal-based Aloveen is the pick. And for everyday medicated washing with a bit of barrier support, PAW MediDerm does the job.

The trick most people miss isn't which bottle you grab — it's matching the shampoo to the real issue, and using it properly (leaving it on long enough). Below we'll walk through which shampoo suits which problem, how to use them so they actually work, and the honest bit: when a recurring skin issue means it's time for a vet, not another wash.

Match the shampoo to the actual problem

Medicated shampoos aren't all the same, and "more medicated" doesn't mean "better." Each one is made for a particular kind of skin trouble, so the first job is working out what you're dealing with — ideally with your vet, especially if the skin looks infected (Merck Veterinary Manual).

Here's how the three NZ favourites compare:

| Shampoo | Best for | Type | |---|---|---| | Malaseb | Yeasty / bacterial itchy skin (smelly, greasy, scratchy) | Antifungal + antibacterial (medicated) | | Aloveen | General itch, sensitive skin, allergy maintenance | Soothing oatmeal (gentle) | | PAW MediDerm | Everyday medicated washing + skin-barrier support | Gentle medicated |

Malaseb — the top all-rounder for yeasty, itchy skin

If your dog's skin is itchy, greasy and a bit smelly — that classic "yeasty dog" funk — Malaseb is usually the one to reach for. It's a medicated shampoo that tackles both fungus (yeast) and bacteria at once, which is why so many NZ vets recommend it for the kind of skin infections that flare up on allergy-prone dogs (Virbac).

It's our top all-rounder because those yeasty and bacterial flares are so common, and Malaseb handles both at the same time. The catch: because it's a genuine medicated product with active drugs, it's best used for an actual skin infection — and for ongoing or severe cases your vet may want to confirm it's the right choice and check there's nothing else going on. It's the shampoo to clear a flare, not an everyday wash.

Aloveen — gentle oatmeal for itch and sensitive skin

Not every itchy dog has an infection. Plenty just have sensitive, irritated or allergy-prone skin that needs calming, and that's where Aloveen shines. It's an oatmeal-based shampoo designed to soothe and moisturise rather than treat an infection, which makes it gentle enough for regular use (Virbac).

This is the pick for general itch, dry or sensitive skin, and for allergy maintenance — keeping the skin comfortable between flares. A lot of allergy dogs end up using both: Malaseb to clear an active yeasty or bacterial flare, then Aloveen as the gentle regular wash that keeps things settled. If allergies sound like your dog's story, our dog allergies treatment and relief guide goes deeper into managing the whole picture.

PAW MediDerm — gentle medicated and barrier support

Sitting nicely between the two is PAW MediDerm, a gentle medicated shampoo aimed at everyday washing with a bit of skin-barrier support. It's a sensible middle-ground option for dogs who need something a step up from a plain shampoo but don't have a full-blown infection that calls for Malaseb.

Think of it as the supportive, lower-key option — useful for keeping irritated skin clean and the skin barrier in better shape, without the heavier antifungal punch. As always, if you're not sure whether your dog needs a gentle medicated wash or a proper antifungal one, your vet can point you the right way.

How to use a medicated shampoo properly

This is where most washes fall down. A medicated shampoo only works if the active ingredients get enough contact time on the skin — rushing the rinse is the number one reason people feel like the shampoo "didn't do anything."

Here's the order to follow:

1. Wet your dog thoroughly with lukewarm water, right down to the skin.
2. Lather the shampoo in well, working it down through the coat to the skin — not just over the top of the fur. That's where the problem lives.
3. Leave it on for about 10 minutes. This is the bit people skip. Set a timer, have a chat, give a treat — just let it sit so the actives can work.
4. Rinse thoroughly so no shampoo is left behind, since residue can irritate the skin.
5. Keep it well clear of the eyes the whole time.

How often you wash depends on the product and the condition — during a flare it's often a couple of times a week, easing off as the skin settles. Follow the label and your vet's advice rather than guessing, and don't overdo it.

The honest bit: shampoo treats the skin, not the cause

Here's the thing we'd tell a friend. A medicated shampoo is great for clearing a flare and making your dog comfortable — but it treats the skin on the surface. It doesn't fix why the skin keeps going wrong.

If you find yourself buying bottle after bottle, or the itch comes roaring back every few weeks, that's a sign of an underlying cause — most often allergies, but sometimes ear infections, a parasite issue, or a skin infection that needs prescription treatment (Merck Veterinary Manual; Companion Animal New Zealand). For a skin infection in particular, your vet should confirm which medicated shampoo (and whether anything stronger) is right, because the wrong product can let the problem drag on.

So by all means use the right shampoo to settle a flare — but for a recurring problem, the most useful thing you can do is book a vet visit and get a diagnosis. Our dog allergies treatment and relief guide is the place to start if you suspect allergies are behind it.

The bottom line

There's no single best medicated dog shampoo — there's a best one for your dog's problem. For yeasty or bacterial itchy skin, Malaseb is the all-rounder. For general itch and sensitive, allergy-prone skin, gentle Aloveen keeps things calm. For everyday medicated washing with barrier support, PAW MediDerm is a solid middle pick. Whichever you choose, lather it to the skin, leave it on for about 10 minutes, rinse well and keep it out of the eyes. And if the problem keeps coming back, don't keep buying shampoo — get a vet diagnosis and sort the cause for good.