Ticks in the UK — A Growing Concern
Ticks are external parasites that feed on the blood of mammals, birds, and reptiles. In the United Kingdom, the population and distribution of ticks has expanded significantly over recent decades, driven partly by changes in land use, increasing deer populations, and milder winters. Ticks are no longer confined to remote moorland — they are now found in woodland edges, urban parks, hedgerows, and even suburban gardens across England, Scotland, and Wales.
For pet owners, ticks matter for two reasons: they can transmit serious diseases to both animals and humans, and a heavy tick burden can cause local skin reactions or, in extreme cases, anaemia in small animals. Understanding which ticks are present in the UK and how to deal with them effectively is an important part of responsible pet ownership.
UK Tick Species
The sheep tick, Ixodes ricinus, is by far the most common tick species in the UK. It is a three-host tick, meaning it feeds on a different host animal at each of its three life stages — larva, nymph, and adult. It is most active in spring and autumn, though it can be active whenever temperatures are above approximately four degrees Celsius, meaning activity can continue throughout winter in mild years.
Other tick species found in the UK include the hedgehog tick (Ixodes hexagonus), the bird tick (Ixodes frontalis), and the occasional exotic species introduced via travelling or imported animals. Ixodes ricinus is the primary vector of disease concern in the UK.
Lyme Disease — Risks for Dogs and Humans
Lyme disease is caused by the bacterium Borrelia burgdorferi, transmitted through the bite of infected Ixodes ticks. It is the most significant tick-borne disease in the UK, affecting both dogs and humans. Public Health England estimates that between 2,000 and 3,000 cases of Lyme disease are diagnosed in humans in England and Wales each year, with actual numbers likely higher due to under-reporting and diagnostic challenges.
Lyme Disease in Dogs
Dogs infected with Borrelia burgdorferi may show signs including lethargy, shifting lameness, swollen joints, loss of appetite, and fever. Some dogs develop Lyme nephritis, a serious kidney complication that can be life-threatening. Importantly, many infected dogs show no signs at all, and positive blood tests in dogs are relatively common in tick-endemic areas. A positive antibody test does not automatically mean treatment is required — your vet will interpret results in the context of clinical signs.
Lyme Disease in Humans
Early Lyme disease in humans often presents with the characteristic expanding red rash known as erythema migrans, sometimes described as a bull's-eye rash, though this is not always present. Later-stage Lyme disease can affect the joints, nervous system, and heart. If you find a tick on yourself or notice a suspicious rash after a tick bite, seek advice from your GP promptly. Early antibiotic treatment is highly effective.
Importantly, the tick must generally be attached for at least 24 to 48 hours to transmit Borrelia, which is why prompt and correct tick removal is such an important preventative measure.
Babesia Canis — An Emerging Threat
Babesia canis is a blood parasite transmitted by the ornate cow tick, Dermacentor reticulatus, which was not historically established in the UK. However, a cluster of autochthonous — meaning locally acquired — Babesia canis cases in dogs in the Harlow and Essex area between 2016 and 2019 raised serious concern, as these dogs had not travelled abroad. The vector tick has since been confirmed in this area and potentially others.
Babesia canis destroys red blood cells, causing haemolytic anaemia. Affected dogs can deteriorate rapidly, showing signs of pale or yellow gums, weakness, dark or discoloured urine, collapse, and fever. Without treatment, the condition can be fatal. There is currently no licensed vaccine for Babesia canis in the UK, and treatment requires specialist antiparasitic drugs not widely stocked by general practices.
Any dog in Essex, east London, or surrounding areas showing signs of sudden severe illness with anaemia should be considered a potential Babesia case, and vets in these regions have been advised to maintain heightened awareness. If your dog develops sudden unexplained illness after a tick bite or after visiting these areas, contact your vet immediately and mention the possibility of Babesia.
Tick Risk Maps and High-Risk Areas
The UK Health Security Agency (UKHSA) and the Big Tick Project — a large study conducted by the University of Bristol — have produced data on tick distribution across the UK. High-risk areas include the Scottish Highlands, the New Forest, the South Downs, Dartmoor, Exmoor, the Lake District, and the Yorkshire Moors, though ticks have been reported across virtually every county. Tick risk maps are available on the UKHSA website and are updated periodically.
Regardless of your location, checking your pet after every walk in woodland, long grass, or heathland is advisable. Ticks tend to congregate in areas of transition — where long grass meets short grass, or where woodland meets open ground.
Checking Your Pet for Ticks
After walks in tick habitat, run your fingers slowly through your pet's coat, paying particular attention to the following areas where ticks commonly attach:
- Around and inside the ears
- Between the toes and around the paw pads
- The groin and inner thighs
- The armpits and chest
- Under the collar
- Around the tail base
Ticks vary in size depending on how long they have been feeding. An unfed tick may be no larger than a poppy seed, making them easy to miss. An engorged, well-fed tick can be the size of a small grape and is easy to feel as a raised lump.
Safe Tick Removal
Never squeeze, twist aggressively, burn, or apply petroleum jelly to a tick. These methods can cause the tick to regurgitate gut contents into the wound, increasing the risk of disease transmission. The correct technique is to use a proprietary tick removal tool — the most widely recommended in the UK is the Tick Twister, a small plastic hook available from vets, pet shops, and online.
To remove a tick correctly using a Tick Twister or similar hook tool, slide the hook under the tick as close to the skin as possible and rotate counter-clockwise — the direction recommended on the packaging of most UK tick removers. The tick unscrews naturally with gentle rotating pressure. Pull upward and outward slowly and steadily without jerking. Once removed, place the tick in a sealed bag or crush it in tissue — do not crush it with bare fingers. Clean the bite site with antiseptic and wash your hands.
Fine-tipped tweezers can be used if a dedicated tool is not available — grasp the tick as close to the skin as possible and pull upward with steady, even pressure.
Tick Prevention Treatments
Isoxazolines
Oral isoxazoline products — fluralaner (Bravecto), afoxolaner (NexGard), and sarolaner (Simparica) — provide excellent tick control in dogs by killing ticks rapidly after they bite. These are prescription products available from your vet and are particularly recommended for dogs regularly walking in high-risk areas.
Spot-On Treatments
Several spot-on products are effective against ticks. Products containing permethrin repel and kill ticks on contact before they attach, which is a significant advantage — however, permethrin is extremely toxic to cats and must never be used in households with cats or applied to cats under any circumstances.
Tick Collars
The Seresto collar, containing imidacloprid and flumethrin, provides up to eight months of tick and flea control and is a popular long-duration option. It is available for both dogs and cats. Studies have shown effective tick repellency and killing in independent trials, and it is a convenient option for owners who struggle with monthly treatments.
Whichever product you choose, discuss it with your vet in the context of your pet's lifestyle, health status, and local tick risk. No treatment is 100% effective, so combining preventative treatments with regular tick checks after walks remains the gold standard approach.