It's not hot, and the dog has been panting with its tongue out.

Does the subject want to ask "the reason why dogs keep sticking out their tongues and panting when the weather is not hot"? Strenuous exercise and illness.

1, according to the query of Techong. com, it is normal for dogs to stick out their tongues and gasp when they are exercising vigorously or are very excited.

2, colds, fever, heart disease, respiratory diseases, etc. It will make the dog stick out its tongue and gasp. Dogs had better have a physical examination.