Flea and Tick Treatments for Dogs Linked to Environmental Contamination, Experts Warn

Bruno, an 18kg lagotto romagnolo, is susceptible to ticks, much to the concern of his owner, Kath. During a holiday in Scotland, Kath removed over 30 ticks from Bruno, and his groomer found an additional 13 the following week. To administer oral tick treatment, Kath has to break the tablets into small pieces mixed with yogurt, as Bruno is reluctant to take the medicine.

Ticks are not only unpleasant but can also transmit various diseases, including Lyme disease, babesiosis, and, although rare in the UK, tick-borne encephalitis, which can lead to severe symptoms.

Veterinary recommendations for tick prevention typically involve medications containing pesticides like neonicotinoids. Some common ingredients include fipronil and imidacloprid, present in products like NexGard Spectra and Advocate. While these treatments are effective, research indicates that toxic chemicals from these products are entering freshwater ecosystems and may have serious ecological impacts. For instance, fipronil and imidacloprid are reportedly 7,000 times more toxic to bees than DDT.

Rose Perkins, a veterinarian and environmental researcher, cites studies from the Netherlands linking these pesticides to declines in aquatic life and bird species at levels found in the UK.

The precise route of contamination is not fully understood, but ‘spot-on’ treatments can wash away into rivers, especially if pets swim or are bathed after application. Perkins critiques the common practice of year-round parasite treatment, suggesting that a more targeted approach based on individual pet needs and environments be adopted.

Ian Wright, another veterinarian, highlights that improper product use contributes to the problem, with many pet owners washing treated pets soon after application. He emphasizes the veterinarian's duty to address parasite infestations as a welfare issue.

In light of growing environmental concerns, alternative, eco-friendly pest control products are becoming available. However, both Wright and Perkins remain skeptical about their effectiveness. Wright notes that many natural solutions do not provide sufficient efficacy against fleas, which can reproduce rapidly.

Products often promoted as natural include essential oils like cedar, lavender, citronella, and neem oil, which have historical use against pests but lack comprehensive scientific validation. Oliver Bristowe, founder of Pets Purest, argues for the use of such natural alternatives, citing their long-standing traditional usage despite limited modern research.

Kath has considered switching to skin-applied medications for Bruno but decided against it after learning they could be worse for the environment. She expresses caution about products that may harm local rivers, given her interest in wild swimming.

For pet owners wary of chemical treatments, regular inspections for ticks and fleas, proper disposal of pet waste to prevent contamination, and keeping pet bedding clean are advised. While there is no foolproof method to prevent tick infestations, awareness and proactive care can help mitigate risks.