As Tokyo Warms Early, Pets in High-Rises Face Hidden Dangers

Veterinarians urge precautions as heatstroke cases rise in urban pets

Tokyo — As early summer temperatures creep upward in the heart of Tokyo, local veterinarians are raising concerns about the growing number of heat-related illnesses in pets—especially those living in high-rise apartments.

A Sudden Heat Spike, and a Subtle Risk

In May, temperatures in the city can jump unexpectedly, catching even seasoned pet owners off guard. “Every year, we start seeing more cases of heatstroke in dogs and cats right around this time,” said staff at Anima Animal Hospital in Tsukishima. “Owners don’t always realize how quickly indoor conditions can become dangerous—especially in homes with strong afternoon sun.”

Unlike humans, dogs and cats have limited means to regulate their body temperature, making them more vulnerable to even moderate heat and humidity. The urban heat island effect can further amplify these risks.

Creating a Safe Home Environment

Veterinarians recommend keeping indoor temperatures below 28°C (82°F), using air conditioning or fans if needed. Curtains should be drawn during the day, particularly in west-facing apartments where the afternoon sun is strongest.

Other tips include:

• Ensuring pets have access to cool, shaded areas in the home.

• Providing fresh, clean water at all times.

• Avoiding the use of heated floors or rugs, which can retain warmth.

Timing Walks and Watching Behavior

Outdoor activities should be scheduled during the cooler hours—early morning or late evening. “Hydration is key,” said a veterinarian at Anima. “We encourage owners to bring water for their pets during walks, just as they would for themselves.”

Pets may also show early signs of heat-related stress through subtle behavior changes, such as reduced appetite or lethargy. These should never be ignored.

Weight, Health Checks, and Preventative Care

Overweight pets are at particular risk. Excess fat makes it harder for animals to dissipate heat, and obesity can mask early signs of heat exhaustion. Regular checkups can help catch issues before they become serious.

“It’s important not to suddenly ramp up outdoor activities,” warned the clinic. “Let your pets gradually acclimate to the heat.”

A Seasonal Reminder for Responsible Pet Ownership

As Tokyo moves into summer, Anima Animal Hospital urges all pet owners to stay alert and proactive. “The dangers of heatstroke are real—but preventable,” they said.

For further advice or to book a seasonal wellness check, visit www.anima-ah.com.