What environmental factor can significantly affect a pet's health?

Temperature and humidity levels are critical environmental factors that can significantly impact a pet's health. Both extreme heat and cold can lead to serious health issues in animals. For example, pets exposed to high temperatures may suffer from heatstroke, dehydration, or heat exhaustion, especially in breeds that are more susceptible due to their coat type or body structure. Conversely, low temperatures can result in hypothermia or frostbite, particularly for small or short-haired breeds that lack sufficient insulation.

Humidity also plays a role; high humidity can exacerbate heat-related issues, making it harder for pets to cool off, while low humidity can lead to dehydration and dry skin. Therefore, maintaining optimal temperature and humidity levels is essential for the well-being of pets, affecting their overall health and comfort. Factors such as the type of food, owner's schedule, and grooming frequency, while important for pet care, do not have the same fundamental and immediate influence on the pet's environment and health as temperature and humidity do.