A dog's heartbeat rate varies based on a variety of factors including age, size, health, and excitement level. Generally speaking, small dogs will have a faster heartbeat than larger dogs, and puppies will have a faster heartbeat than adult dogs.

Under normal circumstances, the heartbeat rate of adult dogs is 60-100 beats per minute, and the heartbeat rate of puppies is 80-120 beats per minute. In situations of excitement, exercise, or stress, your dog's heart rate may temporarily increase. This is a normal physiological response.

However, if the dog's heartbeat continues to be higher than the normal range, or if the dog's heartbeat or breathing is irregular, Symptoms such as shortness of breath, which may indicate a health problem in your dog, such as heart disease, respiratory disease, etc. If your dog shows these symptoms, it is recommended to take them to the veterinarian promptly.

In short, you should pay attention to your dog’s heartbeat regularly to understand their health status. If any abnormality is found, the dog should be taken to the veterinarian in time to receive timely diagnosis and treatment.