The extreme heat in Denver and across Colorado is expected to impact vulnerable groups, including the elderly, children, and individuals with pre-existing health conditions. Pets are also at risk, as they are susceptible to heatstroke and dehydration. Prolonged exposure to high temperatures can lead to heat exhaustion or heatstroke, which are serious medical conditions. Symptoms to watch for include dizziness, nausea, rapid heartbeat, and confusion. The heat may also increase the risk of dehydration and exacerbate respiratory issues for those with underlying conditions.