Heavy breathing and shaking happening together in a dog usually signals that something is wrong, whether it’s pain, fear, a metabolic problem, or poisoning. A healthy dog at rest breathes 10 to 30 times per minute. If your dog is well above that range while also trembling, and you can’t identify an obvious trigger like a thunderstorm or excitement, the combination points to a problem that needs veterinary attention.
Signs That Need Immediate Veterinary Care
Some combinations of symptoms indicate a genuine emergency. Look at your dog’s gums: if they have a bluish tinge, your dog isn’t getting enough oxygen and needs help right now. Other red flags include abdominal effort while breathing (the belly visibly contracts with each breath), an extended head and neck as your dog strains to get air, weakness or collapse, and any new wheezing, snorting, or whistling sounds.
If your dog is also vomiting, having diarrhea, acting disoriented, drooling excessively, or having seizures alongside the shaking and heavy breathing, treat it as urgent. These combinations often point to poisoning or a serious metabolic crisis.
Pain Is One of the Most Common Causes
Dogs don’t show pain the way people expect. Instead of crying out, many dogs tremble and breathe faster. Arthritis is a frequent culprit, especially in older dogs. You might notice that the shaking and breathing worsen after activity or on cold days, or that your dog is also limping, reluctant to jump, or slower on stairs. Abdominal pain from conditions like pancreatitis or a bloated stomach can also produce this exact combination, often alongside restlessness, a hunched posture, or refusal to eat.
Fear, Anxiety, and Excitement
Anxiety is probably the most common non-medical explanation. Dogs tremble and pant during thunderstorms, fireworks, car rides, and vet visits. Some dogs shake just from the excitement of their owner coming home. The key difference between anxiety and a medical problem is context. If the shaking started when the storm did and stops when the storm passes, anxiety is the likely answer.
Early signs of stress that often accompany anxious shaking include yawning, lip licking, pulling the ears back, and salivation. If you notice these alongside the heavy breathing, your dog is probably frightened rather than sick. But if the shaking seems out of proportion to the situation, happens with no identifiable trigger, or is new behavior for your dog, don’t assume it’s just nerves.
Poisoning and Toxic Exposures
Tremors paired with rapid breathing are a hallmark of many types of poisoning. Chocolate is one of the most well-known triggers, but snail baits containing metaldehyde are particularly dangerous, as are certain flea products made with permethrin (especially products designed for dogs that accidentally get applied to cats, or used in excess). Symptoms of poisoning can also include weakness, disorientation, drooling, vomiting, diarrhea, and seizures.
If there’s any chance your dog ate something toxic, don’t wait for more symptoms to develop. Time matters with poisoning, and early treatment dramatically improves outcomes.
Low Blood Sugar and Low Calcium
Two metabolic drops can cause shaking and fast breathing almost simultaneously: low blood sugar (hypoglycemia) and low calcium (hypocalcemia).
Hypoglycemia is most common in small breeds and puppies. When blood sugar dips too low, dogs tremble, become weak, and can progress to seizures. This can happen if a small dog skips meals, overexerts, or has an underlying condition like liver disease.
Hypocalcemia is especially important to know about if your dog is nursing puppies. A condition called eclampsia drains calcium from the mother’s blood to supply her milk. Panting and restlessness are the earliest signs, followed by mild tremors, muscle stiffness, and an unsteady walk. Without treatment, it can progress to severe tremors, full seizures, dangerously high body temperature, and even death. The mechanism is straightforward: calcium normally stabilizes nerve and muscle cells. When calcium drops, those cells fire too easily, causing muscles to contract on their own. Small-breed mothers with large litters are at highest risk.
Heart and Lung Problems
Congestive heart failure causes fluid to build up in or around the lungs, making breathing progressively harder. The most common symptoms are coughing and labored breathing. Dogs with heart failure often breathe faster even during sleep. A normal sleeping breathing rate is under 30 to 35 breaths per minute. If your dog consistently breathes faster than that while resting or asleep, it’s worth counting and reporting to your vet.
The shaking in heart disease can come from the effort of trying to breathe, from weakness as the heart struggles to pump effectively, or from the anxiety that accompanies the sensation of not getting enough air. Heart failure is more common in older dogs and certain breeds, and it typically develops gradually rather than appearing overnight.
Seizure Disorders and Neurological Conditions
What looks like shaking can sometimes be a seizure or the aftermath of one. During a seizure, dogs may collapse, stiffen, jerk, twitch, drool, chomp their jaws, or paddle their legs. After a seizure ends, dogs often pant heavily and tremble for minutes to hours as their brain recovers. If the “shaking” episode involved any loss of consciousness or uncontrollable jerking movements, seizure activity is a strong possibility.
A condition called steroid-responsive shaker syndrome causes whole-body tremors that worsen with excitement, stress, or exercise. It’s most common in dogs under five years old. Despite its older nickname of “Little White Shaker Dog syndrome,” it can affect dogs of any color or breed. It involves immune-related inflammation in the brain and typically responds well to treatment.
Nausea and Stomach Upset
Dogs frequently shake when they feel nauseous, and nausea also causes panting. Other clues that your dog’s stomach is the problem include lip smacking, swallowing repeatedly, salivating more than usual, yawning, hiding, and of course vomiting. Nausea can come from something as simple as eating too fast or as serious as a bowel obstruction, so watch for whether it resolves on its own or worsens.
What to Do Right Now
Start by checking for an obvious trigger. Is there a storm? Did your dog get into the trash, find chocolate, or chew on something unusual? Is your dog nursing puppies? Note any other symptoms: vomiting, diarrhea, limping, coughing, disorientation, or changes in gum color. Count your dog’s breathing rate for 15 seconds and multiply by four to get breaths per minute. Anything consistently above 30 breaths per minute at rest is abnormal.
If the heavy breathing and shaking started suddenly with no clear cause, if your dog also seems weak or disoriented, if the gums look pale or blue, or if you suspect poisoning, get to a veterinarian or emergency clinic right away. Severe, sustained tremors can raise body temperature high enough to cause brain damage on their own, making prompt care important even when the underlying cause turns out to be treatable.
If the symptoms are mild and your dog is otherwise acting normally, eating, drinking, and alert, it’s still worth calling your vet to describe what you’re seeing, especially if the shaking is new or seems different from anything you’ve noticed before.