Never, ever leave your dog in the car, temperatures can increase very quickly and can be deadly for your furend.
Make sure your dog has unlimited access to fresh water. Like humans dogs need more fresh water at hot summer days.
Make sure your dog has access to shade when outside or keep and open door for them to get inside when it is too hot.
Take walks during early morings or a while after sunset.
When walking, try to stay off of hot surfaces (like asphalt, concrete ) because it can be harmful to your furend’s paws.
If you think it’s hot outside, it’s even hotter for your pet (try to go out with a winter coat at summer) – make sure your pet has a means of cooling off like shaded area, water baths etc.