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Why collagen loss makes your dog scratch (and why no medication will fix it)

By Dr. Helen Chambers

9 September 202636,9046 min

By Dr. Helen Chambers · 9 September 2026 · 6 min

Dr. Helen Chambers
Dr. Helen ChambersVeterinary surgeon, 14 years in small-animal practice

If your dog is constantly scratching, you've probably already tried everything.

The daily itch tablet. The itch injection. Prescription food. Shampoos. Ear drops.

And if he still licks his paws raw, gets hot spots or has another ear infection every few weeks… you're not alone.

I've treated dogs with exactly this problem for over 14 years.

And I have to tell you something I only truly understood myself quite recently:

Most treatments for itching only suppress the symptom.

They don't repair anything.

They don't rebuild anything.

And that's exactly why the itching keeps coming back.

Most owners are fighting in the wrong place

At first it looks simple.

Your dog scratches. Gets an ear infection. Licks his paws.

So you try what everyone tries.

Salmon oil. Coconut oil. A new food. An elimination diet.

It helps for a while. Then it comes back.

Off to the vet. The daily itch tablet. And suddenly, peace. Your dog sleeps through. You think: finally.

A few days later it starts again.

Quietly at first. A bit of scratching after a walk. Head shaking in the evening. Then the collar again at night. Tick. Tick. Tick.

So the dose goes up. That helps for a few weeks.

Then the itch injection is added. Every four weeks. It helps. Then every three weeks. Then even that isn't enough.

More and more money. Less and less effect.

And the itching still keeps coming back.

The patient who changed everything

Milla was a 6-year-old French Bulldog.

Her owner Hannah did everything right.

Hypoallergenic food. Regular medicated baths. The itch tablet every day.

And Milla still scratched herself raw every night.

Her ears were infected more often than they were clean. Her paws were stained red from constant licking. The skin on her belly was sore and scratched open.

I prescribed stronger medication. No change.

We changed her food. Three times. No change.

Hannah sat in my consulting room and cried.

“Why is she still this bad when I'm doing everything right?” Hannah, Milla's owner

I had no answer.

And I couldn't let it go.

What I found out that night

I couldn't sleep.

I kept thinking about Milla. About all the dogs like her I'd seen in 14 years.

Why did nothing help for long?

At 2am I sat at my desk and started reading studies. Not treatment guidelines. Real research on the skin barrier in dogs.

I read until morning.

And what I found changed everything.

The real cause

We'd been looking in the wrong place the whole time.

It isn't the food.

It isn't “just really bad allergies”.

The real cause is something happening in your dog's skin. Every day. Without you seeing it.

The skin has a protective layer. A barrier. And it is made of collagen.

As long as that barrier is intact, allergens stay outside. Pollen, mites, grasses. Everything bounces off. The immune system stays calm. No itching.

But from their second year of life, every dog loses 7 to 10 per cent of its collagen per year.

Every year the barrier gets thinner.

Gaps appear. Small at first. Then bigger.

And at some point things get through that used to stay outside. They get into the tissue. The immune system recognises intruders and reacts.

That's the scratching.

The ears.

The paws.

The hot spots.

All the same thing. One barrier, giving way in different places.

Why medication always wears off eventually

And now comes the part that explains everything.

The itch tablet pushes the itch signal down. That works. At first, it works really well.

But it doesn't repair the barrier. The gaps get bigger every month. More allergens get through. The immune system has to react harder and harder.

That's why it works for five months and then fades.

Not because the medicine gets worse.

But because the damage underneath gets bigger.

So the dose goes up. It helps for a while. Then it fades again.

So the injection is added. It helps for a while. Then it's needed more often.

More fire extinguishers. A bigger hole in the wall. The extinguishers never catch up. Because they were never built to close holes.

If you've felt like you're spending hundreds and nothing helps for long… you didn't imagine it.

The treatments were never designed to repair the barrier.

Why the usual solutions all fail at the same problem

I held every treatment I know up against this finding.

The daily itch tablet? Pushes the immune reaction down. Doesn't repair the barrier.

The itch injection? Blocks the itch. The barrier keeps crumbling underneath.

Salmon oil? Helps with inflammation. Doesn't build collagen.

Prescription food? Removes triggers. Doesn't repair the barrier.

They all miss the same point: the barrier is missing its building block. And none of these provide it.

What the barrier really needs

The answer isn't another medicine.

It's much simpler than that.

Your dog's barrier is made of collagen. His body used to make it himself. That's why young dogs rarely have allergy problems. The barrier was sealed. Everything stayed outside.

But with age, production drops. The barrier breaks down. And all this time we've only been treating the symptoms. Instead of the breakdown itself.

Collagen isn't a medicine. It doesn't suppress anything.

It's the building block your dog's skin is made of.

When you supply it, the body can rebuild its own protective layer. The barrier gets denser. Allergens stay outside.

The immune system calms down. Not because it's suppressed. But because nothing gets through any more.

That's the difference between covering a problem up and fixing it.

What I gave Hannah

The barrier needs three types of collagen to repair itself.

Type I rebuilds the barrier. 90 per cent of skin tissue is made of it. It's the most important building block.

Type II calms the inflammation that drives the itching. While the barrier still has gaps, the inflammation underneath has to be kept in check.

Type III repairs what the dog has scratched open himself. The sore patches. The hot spots. The scratched ears.

If one of the three is missing, the repair stays incomplete.

Then there's MSM. It helps the body build in new collagen and calm the inflammation.

And hyaluronic acid, which keeps moisture in the skin. Without moisture the skin dries out, cracks, and the barrier breaks open again in new places.

And then something most people overlook: the gut. Dogs with skin problems often have gut flora problems at the same time.

That's no coincidence. Gut and skin are connected. That's why the formula also contains L-glutamine to support the gut, so the skin's repair isn't held back from the inside.

But all of this only works if it actually arrives.

Chews and powders are made with heat. That destroys a large part of the collagen. What's left is broken down further in the stomach. In a dog, almost none of it reaches the barrier.

Liquid is different. Liquid collagen is split into tiny pieces and absorbed directly. 99% reaches the skin.

That was what mattered to me. A formula that contains everything the barrier needs. In a form that actually gets there.

I worked with Kovah on exactly this formula: Kovah Collagen Drops.

Once a day with the pipette over his food. Your dog doesn't notice. Ten seconds, done.

Kovah Collagen Drops given with the pipette over dog food

Because I want as many dogs as possible to benefit, I've arranged an exclusive discount with Kovah for everyone reading this article: right now you get up to 40% off your order.

But I have to say one thing: the drops are made in small batches, because liquid collagen can't be mass-produced like cheap chews. When a batch runs out, there's a wait for the next one.

90-day money-back guarantee.

If nothing changes within 90 days, you get your money back. No questions asked.

Up to 40% off your order

Check availability ››90-day money-back guarantee

If you want to try it, I wouldn't wait too long.

What happened to Milla

I told Hannah: give her the drops over her food every morning. Don't stop anything. Just add them.

The first 2 weeks: Nothing visible. I'd warned Hannah it takes time. The barrier doesn't rebuild overnight.

Week 3: Hannah wrote to me. “It's got quieter at night. Less scratching. Longer gaps in between.”

Week 4: Milla slept through the night. The whole night. For the first time in over two years. Hannah woke up in a panic because it was so quiet.

Week 6: Her ears were clean. Hannah checked them every morning. No smell. No infection. Just clean.

Week 8: The paw licking stopped. The red staining on her paws grew out. New, light fur came through.

Month 3: Together with her vet, Hannah reduced the itch tablet. Half the dose. Then a quarter. Then stopped. No relapse.

Month 4: Milla gets the drops over her food once a day. Nothing else.

Her coat is thicker than it has been in years. She plays again. She follows Hannah from room to room again.

Hannah wrote to me:

I've got my dog back. Hannah, Milla's owner

What other owners say

Sarah M., Leeds

“Hundreds spent at the vet, and at night she just couldn't settle. Constant scratching. Since the drops it's finally quiet. I can stroke her again without her flinching.”

Karen L., Bristol

“His ears were infected every few weeks. Always that brown gunk. Always that smell. Two vets, endless ear drops. Since the drops he hasn't had a single ear infection in 3 months.”

Julie W., Manchester

“My Maltese licked his paws raw for over a year. One, then the other. Since the drops his paws are dry and healing for the first time in months.”

Try it for yourself

Since Milla's story, I haven't been able to let this go.

I recommend Kovah Collagen Drops to my clients.

It's the only liquid formula I know that contains all three types of collagen. Plus everything else the barrier needs: calming inflammation, keeping moisture in, supporting the gut.

Once a day over food. Alongside everything your dog is getting now. Don't stop anything. Just add it.

Right now there's up to 40% off your order.

Plus a 90-day money-back guarantee. If nothing changes, you get your money back.

Try Kovah Collagen Drops now

Check availability ››Up to 40% off · 90-day money-back guarantee

PS: If your dog is only just starting to scratch, you're in the best possible position. The barrier hasn't broken down far yet. Start now. Before the ear infections. Before the hot spots. Before the first month of paying for medication.

Dr. Helen Chambers

For your dog's health,
Dr. Helen Chambers
Veterinary surgeon, 14 years in small-animal practice

Note: itching and skin problems should always be checked by a vet. Kovah Collagen Drops is a complementary feed and not a substitute for veterinary treatment. Results may vary.