The term is about airway shape. It matters in the Central Valley, where summer days often pass 100 degrees.
Why heat is harder
Dogs cool mainly by panting through the upper airway. The AKC Canine Health Foundation describes how short noses and narrowed airways make panting less efficient and more tiring, and its research found these breeds less successful at keeping body temperature normal in heat. Many airlines restrict flat-faced breeds for the same reason. Noisy breathing, snoring, gagging and tiring easily are signs to mention to your vet.
Local numbers
The NOAA 1991 to 2020 normals for Vacaville, about 8 miles from the kennel, show about 28 days a year with highs of 100 degrees or more, and an average July high of 97.3 degrees. On such days a flat-faced dog should be in air conditioning, with short outings in the early morning or evening. Never leave a pet in a parked car.
At Happy Paws
The runs are heated in winter and air-conditioned in summer, and each dog can choose inside or out through a doggie door. Tell the staff at check-in that your pet is flat-faced, and share any past heat or breathing trouble on the pet information page. Bring medications with a schedule. All breeds are welcome.
Related guides
Read heat stroke in dogs, how hot is too hot for dogs and cats in Central Valley heat.
Practical steps before drop-off
Schedule the drop-off for early morning or late afternoon so the ride avoids the worst of the heat. Keep the car cool with air conditioning, offer water, and skip a heavy meal beforehand. If your dog wears a harness, bring it, and use one rather than a collar pulling on a short neck. Mention medications and any past breathing episodes on the form.
Heat is not the only issue: excitement can make flat-faced dogs breathe harder. A calm, brief goodbye helps. Ask on the tour how the run you pick handles sun and shade.