Fleas and ticks are more than a nuisance—they spread dangerous diseases to pets and people. This in‑depth guide explains how these parasites cause allergies, infections, and zoonotic illnesses, and highlights today’s most trusted preventatives, including NexGard, Simparica, and Dr. Hart’s favorite long‑lasting option, Bravecto Quantum. Learn how to protect your pet year‑round and keep your home parasite‑free.