Just like you and other mammals, your pooch also enters the dream state during deep sleep. This phase is rapid eye movement or REM where it is normal for the breathing to get faster.
During REM, the mental processes or the brainwaves of your dog get faster and irregular while the muscles are in a relaxed state. During this phase of heightened mental activity, it is normal for your dog’s breathing patterns to increase.
In fact, both man and man’s best friend have similar brain wave patterns of the sleep cycle, making it safe to conclude that it is normal for dogs to dream (either good or bad) as their human parents do.
Along with rapid breathing, you may also observe your dog’s muscles and eyelids begin to twitch. Plus, you may even hear some little and light barks and whimpers, almost similar to a person talking during REM.
Age Of Your Dog
Did you know that a puppy’s respiratory and heart rates are faster than adult dogs? This is also true during sleep. This is because a puppy’s body is still in the developmental stage. But, as soon as it grows into adulthood, this issue will resolve on its own.
Stress is another reason why your puppy is breathing faster while sleeping. It is natural for a puppy to feel stressed or even scared during its first few days in your home.
After all, it just left its mom and its littermates. It has a new world to explore, new people and perhaps other animals to meet. These can be overwhelming experiences causing your new baby a tremendous amount of stress that results in rapid breathing even while sleeping.
Brachycephalic Dog Breed
If you have a dog with a smashed-face appearance like a Shih Tzu, it is common to see it breathe faster during sleep. This is because of the narrow nostrils of brachycephalic dogs that make breathing more complicated. That said, it is not unusual to see brachycephalic dogs pant even while at rest.
Also, smaller dogs that weigh less than 30 lbs have a faster heart rate that results in faster breathing.