· Mouth Wide - The wider the mouth, the higher your dog’s cooling system is “turned up.” If his mouth is wide open, there likely will be wrinkling at the back corners of his mouth. If you see this, your dog is hot!
· Tongue Long - The further your dog’s tongue is hanging out, the more surface area there is for air to pass over it and cool her down. When your dog’s tongue starts hanging down well past her teeth, chances are she is too hot.
· Tongue Wide - As your dog heats up, his tongue will widen and thin. Just like a long tongue, a wide tongue creates more surface area for air to pass over in order to cool your dog.
· Tongue Dark - The hotter your dog is, the more blood will be sent to her tongue in an attempt to cool off. This increased blood flow will cause the tongue to appear darker.
· Fast Panting - If your dog is panting quickly, he is trying hard to cool off by drawing as much air as possible over the wet surfaces in his nose and mouth.