* Overlapping ingredients: Both flea collars and Frontline typically contain insecticides to kill fleas. Using both together could lead to overexposure to these chemicals, potentially causing toxicity in your dog.
* Potential for interactions: The ingredients in each product could interact with each other, reducing their effectiveness or increasing the risk of side effects.
* Unnecessary risk: Frontline is a very effective flea treatment on its own. Adding a flea collar offers no additional benefit and could introduce unnecessary risks.
Instead of using both, choose one method and stick with it. Consult with your veterinarian to determine the best flea control option for your dog.
Remember to follow the instructions on the product label carefully and monitor your dog for any signs of adverse reactions.