Health · July 9, 2026 · 8 min read

Heatstroke in dogs and cats: do not wait for collapse

Sun, humidity, confinement, and activity can combine quickly. Flat-faced animals, seniors, puppies, and patients with certain conditions need an even wider safety margin.

Dog resting in the shade with fresh water while a guardian checks heat-stress signs.

UNAM has published guidance for protecting dogs and cats during hot weather. An excited dog may keep running after the body has started to lose control of heat. That is part of the danger. Sun, humidity, exercise, and poor ventilation can combine within minutes.

Quick guide: Heatstroke in dogs and cats: do not wait for collapse
	Shade	Move walks and play to the coolest hours of the day.

Heatstroke in dogs and cats: do not wait for collapse

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