Why Tick Collars Are No Longer Reliable for Dogs

What is going on?

Many owners head out for walks with complete peace of mind because their four-legged companion wears a trusted anti-tick collar. Yet, after the walk, ticks are increasingly being found in the coat anyway. This is not simply bad luck: it reflects a marked shift in the parasite situation, including a tick species that is effectively undermining older protection methods.

The shock after a dog walk

When the usual check suddenly becomes genuinely unsettling

After a woodland walk, the routine is usually the same: remove the lead, run a hand through the coat briefly, and that is it. Many people do this rather casually because they rely on the collar. That is precisely where the issue lies.

Then, while stroking the dog, your fingers suddenly catch on a small, hard lump. A closer look makes it immediately clear: a tick is attached, already firmly embedded in the skin. It is not just any tiny tick either, but a comparatively large specimen with conspicuously striped legs.

The first thought is: “But he has his collar; it was always reliable!” The disappointment is considerable and is often followed by frustration with the product or the veterinary practice. At the same time, one question remains: if it worked so well before, why does it no longer?

The situation has changed: not the dog, not the owner, but the opponent has become different.

A new tick species is spreading

Veterinary professionals are reporting increasingly frequent sightings of the tick Hyalomma marginatum, including in areas where it was once virtually absent. It originally comes from dry, warm regions around the Mediterranean. Milder winters and prolonged warm spells are now allowing it to become established farther north.

This tick differs significantly from the more familiar species found here:

• It is larger and appears more long-legged.
• It can actively move several metres towards a target.
• Among other things, it detects animals through body heat and scent.
• It is far more “aggressive” than the typical tick waiting in grass.

In the past, people mainly encountered relatively passive ticks that waited on blades of grass. Now, however, they may be dealing with a true hunter. This makes encounters more frequent and exposes the shortcomings of older protective methods more clearly.

Why the familiar tick collar no longer provides certainty

Permethrin at its limit: when the active ingredient is no longer enough

Many commonly used tick collars rely on the active ingredient permethrin. For decades, this was regarded as a standard solution: put on the collar, allow the active ingredient to spread across the skin and coat, and ticks either die or are at least deterred-or so the principle goes.

In practice, 2026 presents a different picture. For species such as Hyalomma marginatum, permethrin appears to be considerably less deterrent or even almost ineffective. The ticks can still attach themselves and remain in place long enough to transmit diseases.

There is another factor as well: many collars are only reasonably effective when fitted correctly, replaced regularly and not constantly soaked or dirty. In reality, the collar is often too loose, well beyond its recommended replacement date, or has lost much of its active ingredient through swimming and rain.

What was once considered the “gold standard” can now become a risk when it is relied on blindly.

A dangerous false sense of security for dogs and owners

The main issue is generally not just the individual parasite, but its psychological effect. Anyone convinced that their dog is completely protected by a collar often checks less consistently:

• The coat is searched thoroughly less often.
• Ticks go unnoticed for hours or even days.
• Early signs of illness seem harmless and are overlooked.

This can allow pathogens to be transmitted unchecked. These include, for example, the agents responsible for babesiosis, ehrlichiosis and other tick-borne infections that are becoming more common in Central Europe.

The new strategy: protection from within rather than only from outside

Isoxazoline tablets: how modern treatments eliminate ticks

In recent years, chewable tablets containing so-called isoxazolines have become established as an effective alternative. The dog eats these preparations, the active ingredient enters the bloodstream through the gut and is distributed throughout the body.

When a tick attaches, it takes in the active ingredient with the blood and dies shortly afterwards. This prevents it from remaining long enough to regurgitate pathogens back into the dog’s body.

Benefits of this internal method of protection include:

• Its effectiveness does not depend on the coat staying dry.
• Unlike collars, it cannot slip or be lost.
• Ticks are affected with every bite, regardless of where on the body they attach.
• Many products work for several weeks or months.

These medicines are prescription-only. Vets tailor the dose to the dog’s weight, age and health status. Anyone considering a switch should seek advice there rather than ordering treatments online independently.

Checks are still essential

Physical checks remain worthwhile even with modern tablets. No product gives 100 per cent protection, and individual ticks may still attach before they die. A quick inspection after every walk is therefore worthwhile:

• Stand or lay the dog on a light-coloured blanket.
• Starting at the head, part the coat section by section with your fingers.
• Pay particular attention to the ears, neck, armpits, between the toes, groin and tail area.
• Remove suspicious lumps with a tick card or tick-removal tool.

Rather than pulling frantically, grasp the tick as close to the skin as possible and draw it out slowly. Remains such as the mouthparts are unpleasant, but increase the risk of disease less than is often feared. Above all, what matters is reducing the tick’s total attachment time.

How owners can adapt their everyday routine

Rethinking the home environment and routines

Tick protection does not begin only in woodland. The garden, grass outside the house and the dog’s favourite resting places also matter. A few straightforward measures can significantly reduce the risk:

• Mow lawns regularly and cut back tall grass around the edges.
• Thin out dense shrubs where wild animals like to shelter.
• Do not keep piles of leaves or brushwood directly beside the patio or the dog’s resting areas.
• Wash dog blankets frequently and vacuum beds.

During warm, damp periods in particular, it is sensible to limit walks through very dense undergrowth and choose wider paths instead. Anyone familiar with an area of high tick density can apply particularly strict checking routines there.

When should you see a vet?

Even with good protection, owners should stay alert. An appointment at the veterinary practice is advisable if the dog:

• seems suddenly lethargic after a tick bite,
• develops a fever, loss of appetite or lameness,
• has dark urine or noticeably pale mucous membranes.

These symptoms can indicate tick-borne diseases. Starting treatment early significantly improves the outlook. Being able to tell the vet when and where the dog encountered particularly large numbers of ticks helps with the assessment.

Ticks, climate and what else dogs may face

Why new species are appearing-and are likely to remain

The spread of species such as Hyalomma marginatum is closely linked to changing climatic conditions. Milder winters enable more ticks to survive and allow new populations to develop. Migratory birds and transported livestock occasionally bring in unfamiliar species that can become established in new regions.

For dog owners, this means that strategies which were sufficient ten or fifteen years ago often no longer fit today’s circumstances. Those who do not adjust their protection are, quite literally, falling behind developments.

What owners should remember

Essentially, three factors make the difference:

Anyone who understands that the problem is not the “wrong dog” or a “poor breed”, but a changing mix of parasites, can respond more calmly while also acting more consistently. Woodland and meadows can then remain places that dogs and people enjoy exploring-just with tick protection that has not been left in the last decade.