Allergic skin usually looks red, inflamed, and irritated, often with hot spots, hair loss, or thickened skin where your dog's been scratching for weeks or months. Food is one possible cause, alongside fleas and things in the environment like grass, pollen, or dust.
What does allergic dog skin actually look like?
Allergic skin is usually red and inflamed, sometimes with visible hot spots, patchy hair loss, or a thickened, darker look in spots your dog keeps going back to. A hot spot is a small, angry patch of raw, wet skin that appears fast, often overnight, because your dog has been licking or chewing at one area.
Skin that's been irritated for a long time changes. It can turn tougher and darker than the skin around it, almost leathery, because constant scratching and licking is your dog's body responding to ongoing inflammation. You might also notice a smell, greasy patches, or skin that feels warm to touch. None of this tells you the cause on its own. It tells you the skin has been under stress for a while.
Why does the skin sometimes get worse, not better?
Skin that's been scratched raw is easy for yeast and bacteria to move into, and once that happens the itching usually gets worse, not better. This is a secondary infection, an infection that sets up on top of the original irritation. It needs veterinary treatment. No food change fixes an infection once it's taken hold.
Signs of a secondary infection include a stronger smell, thick or discoloured discharge, skin that's hot or tender, and scratching that keeps escalating no matter what you try. If your dog's skin looks like this, see a vet before changing anything else. Treat the infection first, then work out what triggered it, food or otherwise.
Does where the itch shows up tell you anything?
Where the irritation sits on your dog's body is one of the better clues you have. Paws, ears, the belly, and the armpits point more toward an allergy, food or environmental. Irritation concentrated at the back end, around the tail base and lower back, points more toward fleas.
A dog that's constantly licking its paws or has ears that flare up again and again fits the allergy pattern. A dog scratching hard just in front of the tail, especially with small scabs, is the classic flea pattern, even if you can't spot a single flea on them. One bite is enough to set off a reaction in a sensitive dog, so fleas are worth ruling out properly before you look anywhere else.
What makes New Zealand's climate a factor?
Much of the country has a long pollen season, and North Island summers are humid. Both give environmental and yeast-related skin trouble more chances to flare than a drier, more seasonal climate would. Grass seeds are a summer hazard, especially for dogs that spend time in long grass or paddocks. Fleas can stay active year-round in warmer parts of the country, rather than easing off over winter.
None of this rules food in or out by itself. A vet who knows your region and the time of year is well placed to help you weigh it up.
When is it worth looking at food?
Food is worth investigating properly once you've ruled out fleas. Especially if the irritation doesn't ease off with the seasons, and it's showing up in the paws-ears-belly pattern rather than around the tail base. The signs that point toward food are covered in is my dog allergic to their food?
If food turns out to be part of the picture, a simple, single-protein food is a sensible starting point. Wait until any infection is under control and your vet's in the loop. Our hypoallergenic kibble uses one hydrolysed chicken protein, broken down so small your dog's body is less likely to react to it. It's grain-free and free from beef, dairy, gluten, wheat, fillers, and artificial colours. You can try a 2kg sample for $19.99 before committing to a full bag, backed by our 30-day Sensitivity Promise.
For more on what hypoallergenic means see our complete NZ guide.
FAQ
Can food alone cause hot spots?
It can be part of the picture. But hot spots usually start with scratching or licking triggered by something, whether that's food, fleas, or an environmental allergy. They get worse once the skin breaks down. A vet is the best judge of whether a hot spot needs treatment before you look at diet.
How do I tell a food allergy from a flea problem?
Location is a useful clue. Paws, ears, and belly lean toward allergy. The area around the tail base and lower back leans toward fleas. One bite can set off weeks of itching in a sensitive dog, even if you never spot one. Flea treatment is worth ruling out first either way.
Is a secondary skin infection serious?
It needs a vet. Left alone, an infection on top of already irritated skin tends to get worse rather than settle on its own, and a food change won't treat it. Get the infection sorted first, then work out what triggered the original irritation.
Does the weather really affect my dog's skin?
It can. New Zealand's pollen season is long in many areas, and humid summers, especially in the North Island, suit yeast. Grass seeds are a summer risk too. None of this replaces a vet's opinion on your dog specifically, but it's a real factor alongside food and fleas.
My vet already has my dog on a diet for this. Should I switch?
No, not on your own. If your vet has diagnosed the cause and put your dog on a diet that's working, stay on it, or discuss transitioning to another option with them. If they've given you the ok to move to a maintenance food, that's when it's worth looking at something like Little Green Dog.