But through its sustained release technology provides continuous 8-month protection against fleas and ticks.

How Seresto® Works. Seresto® collars contain 4.5% flumethrin and 10% imidacloprid. The collar slowly and continuously releases these active ingredients onto your pet's skin over 8 months. The active ingredients spread along the pet's skin and haircoat to help protect against external parasites.

A recent investigation from USA TODAY revealed troubling statistics about the popular flea and tick preventative Seresto collars. The article states that the collar is responsible for more than 1,500 pet deaths and more than 75,000 other 'incidents', including nearly 1,000 cases causing human harm.

Our top option for flea and tick control is the Seresto Flea and Tick Collar for Dogs, featuring a controlled release across your pet's full body, works for up to eight months, and targets all pest life stages.

K9 Advantix II kills fleas within 12 hours. Seresto kills fleas in under 24 hours and kills or repels re-infesting ticks within 6 hours. Both products kill and repel fleas, kill flea larvae and eggs, kill and repel ticks, and treat lice.

Seresto kills existing fleas on cats within 24 hours after application. After those 24 hours, new fleas are killed within 2 hours.

It is safe to allow pets to sleep in bed with you while wearing this collar. The active ingredients spread from the site of direct contact over the skin surface, so it is not recommended to continuously touch the collar.

It works by releasing its active ingredients in controlled, low doses, allowing your dog to stay protected for eight months at a time. Odourless, water-resistant and effective against both fleas and ticks, the Seresto™ dog collar is the simple, easy way to keep your best friend protected for longer.

Less common, but more serious reported adverse events, include neurological symptoms, such as convulsions or ataxia. Monitor your pet for side effects or signs of sensitivity after applying the product, particularly when using the product on your pet for the first time.

Things to look for include:

• Redness or irritation around the collar site.
• Alopecia (hair loss) around where the collar sits.
• Temporary reduced appetite after applying the collar.
• Stomach issues (vomiting or diarrhea)
• Other noticeable changes in behavior such as excessive scratching at the collar, restlessness, or agitation.

EPA confirms continued registration of the collar. Comprehensive data affirms the safety profile of Seresto. As part of EPA's scientific review process, the agency analyzed incident data including third-party assessments and compared data to other EPA-registered pet products.

However, some pet owners have pointed to the collars as the reason their dogs have suffered from lethargy, loss of motor functions, skin problems, and seizures. "My takeaway is that it should be looked into," says Elizabeth Trepp, DVM.