ALZOO™ Plant-Based Flea & Tick Collar for Dog, Medium repels Fleas, Ticks, and Mosquitoes using Natural Plant-Based Active Ingredients | for Medium-Sized Dogs | Phthalate and PVC Free NATURAL REPELLENT AND PREVENTIVE. The ALZOO™ Flea & Tick Collar utilizes natural plant-based active ingredients to effectively repel fleas, ticks, and mosquitoes while helping to prevent bites and pest irritation. *SUSTAINABLE, SAFE & POWERFUL • Proven, safe, and effective for dogs and kids when used as directed. • Laboratory tested for efficacy. • Cruelty-free • Made in the USA using recycled and recyclable packaging. *DURABLE & SUITABLY SIZED- • Effective for up to 4 months on Fleas & Ticks. • Replace the collar every 4 months for maximum protection. • For Medium-Sized Dogs: 16-40 lbs. *WATERPROOF -The ALZOO™ Flea & Tick Collar is Waterproof and does not need to be removed when bathing your pet.