Heatstroke in Cats: Signs, Treatment, and Prevention

Veterinary reference source, publication date not stated.

Key findings

Quantified body-temperature thresholds: normal 100.5–102.5°F; heat exhaustion ~103–104°F; heatstroke/hyperthermia above 104°F, life-threatening at 105°F+. Outdoor ambient at or above 90°F (32°C), especially with direct sun and no shade/airflow, is dangerous — directly relevant since a sealed OSB box in South Texas sun can trap air well above ambient. Vulnerable populations (seniors, kittens under 4 months, obese cats, prior heatstroke survivors) need extra safety margin — relevant since a community cat’s health status is generally unknown. Prevention implication: shade, airflow, and avoiding heat-trapping enclosed volumes are the core mitigations, arguing for deliberate summer venting/shading rather than relying on insulation alone.

Why it matters for this archive

The authoritative veterinary-temperature-threshold source grounding the heat-stress risk analysis in hard numbers — no shelter-design guide provides this on its own. Any South Texas cat-shelter experiment must design against these specific thresholds, not general intuition about “too hot.”