Question 1

Why has my dog's flea and tick spot-on stopped working?

Accepted Answer

The most common reasons are that the product uses older active ingredients like permethrin that local parasite populations have developed resistance to, or the dose in over-the-counter products is too low for high-pressure environments. Supermarket and pet shop brands are particularly prone to this — prescription-strength or veterinary-grade products with newer actives tend to perform significantly better.

Question 2

Is the Seresto collar safe for dogs with children and cats in the house?

Accepted Answer

The Seresto dog collar is safe around children with normal contact — the active ingredients are locked in the polymer matrix and don't transfer readily to skin. Young children shouldn't handle or chew the collar directly. Around cats, the dog version of the Seresto collar should never be placed on a cat, but a dog wearing the collar poses minimal risk unless a cat is constantly grooming around the dog's neck for extended periods.

ChatGPT questions, Claude answers: Spot-on stopped working? Best flea collar for Border Collies