Dog Panting on Prednisone: Normal or a Warning Sign?

A dog panting on prednisone is usually showing a common side effect, but panting with weakness, vomiting or collapse needs an emergency vet now.

Go to an in-person emergency vet now if the panting comes with collapse, pale or blue gums, real struggling to breathe, bloody vomit or black stools, a seizure, or a dog that got hot outside and cannot settle.

If none of those signs are present, take a breath. The sections below explain why steroids cause panting, what normal looks like, when to go in, and what to do tonight.

Why prednisone makes dogs pant

Panting is a recognized, common steroid side effect, usually alongside drinking more, peeing more and being hungrier. VCA Animal Hospitals lists increased drinking, urination and appetite as the common side effects of prednisone and prednisolone, with panting among the effects seen at higher doses or with longer use. The American Kennel Club lists more frequent panting in the same side-effect list as restlessness, so a dog that is restless on prednisone, drinking a lot and panting is showing one cluster of expected effects. Steroids change how the body handles water, heat and energy, so the panting tends to travel with the drinking, the peeing and the begging.

In a small BMC Veterinary Research study with 31 evaluable dogs on short courses of prednisone or prednisolone, by day 5, 74% (23/31) of owners reported at least one change in their dog's behavior, including more urination, more drinking, more hunger, faster breathing or panting and/or more vocalizing; by day 14, 90% (28/31) reported at least one such change. Increased drinking and urination were the most common. That is one small study, not a claim about most dogs. RexVet's page on what prednisone treats and its side effects covers the rest of the list, without doses.

What normal steroid panting looks like

VCA's Steroid Treatment page lists the short-term side effects of steroids in dogs as increased thirst and urination, increased hunger, panting, a general loss of energy, the development or worsening of infections (especially bacterial skin infections) and, less commonly, vomiting or nausea. Expected panting sits inside that picture:

Your dog pants at rest in a cool room, often worse at night.
Your dog still eats, in fact begs for food, and walks normally.
The gums are pink, and your dog settles when lying down.
The water bowl empties faster and there are more requests to go out.

A dog panting at night on prednisone is common: the house is quiet, the restlessness is easier to notice, and a thirsty dog is up and down to the bowl. A senior dog panting on prednisone often shows it most once the household settles. If the dog is bright, responds to your voice, drinks, eats and eventually sleeps, that is the side effect, not a crisis. RexVet's guide to other reasons dogs pant covers what a veterinarian rules in or out.

Dog panting on prednisone: when it is a warning sign

The rule is panting PLUS something else. Panting alone in a bright dog that eats and has pink gums is a side effect. Panting with any of the following is a warning sign:

Weakness, wobbliness or extreme lethargy
Vomiting or diarrhea
Refusing food
Black or tarry stools, or bloody vomit
A swollen or painful belly
Pale or blue gums
Breathing that is labored, with whole-body effort or a visible struggle to inhale, rather than just fast
Confusion or collapse

VCA lists lack of appetite, black or bloody stools, bloody vomit and high fever as the signs of gastrointestinal ulceration, and says they mean contacting your veterinarian immediately. Merck Veterinary Manual describes lethargy, weakness, vomiting and diarrhea as the signs of an Addisonian-like crisis. Either cluster means a veterinarian tonight, not a wait until morning, and the veterinarian, not you, decides what happens to the pills.

Bloody vomit, black stools, a swollen or painful belly, confusion, collapse, pale or blue gums or labored breathing cannot wait for morning: go now, whatever the hour. With none of the red flags, the online-vet section below covers your case.

The Florida, New York and Virginia heat factor

A dog already panting from a steroid has less headroom on a hot, humid day. Heatstroke is a separate, in-person emergency that a video visit cannot treat, and Florida, New York and Virginia summers plus a steroid-panting dog means go earlier, not later.

Cornell's Riney Canine Health Center says a dog's normal body temperature is between 100.5 and 102.5 degrees Fahrenheit, and heatstroke results when the dog cannot regulate its temperature and it rises to 105 degrees Fahrenheit or higher. Cornell lists heavy panting, drooling, bloody diarrhea, vomiting, weakness, confusion, seizures and collapse as the signs, and says flat-faced (brachycephalic) breeds, elderly and overweight dogs, thick- or dark-coated dogs and dogs with breathing or heart disease are at higher risk. In Cornell's words, "Heatstroke is a medical emergency and requires intensive critical care."

If a dog that was outside in the heat cannot settle, drools heavily, vomits, wobbles or collapses, begin cooling on the way and go to an in-person emergency vet now; do not stay home to run a cooling routine. See RexVet's heatstroke warning signs page. For the rest of the course:

Walk at dawn or after dark in Florida summers and on the hottest New York and Virginia days.
Shade and fresh, cool water wherever the dog is.
No waits in a parked car, not even a short one.

Do not stop the pills on your own

The instinct at midnight is to skip tomorrow's pill and see if the panting stops. Do not. VCA's prednisone page says: "Do not stop this medication abruptly; taper it slowly to avoid complications." The American Kennel Club says you should "never abruptly stop giving your dog prednisone. It must be tapered down," because long-term use can suppress the body's natural cortisol production. VCA's Steroid Treatment page tells owners who think the schedule needs changing to "contact your veterinarian rather than changing the dosing schedule."

Merck Veterinary Manual explains why. In animals whose adrenal function has been suppressed by longer use, abrupt discontinuation may lead to an Addisonian-like crisis "characterized by lethargy, weakness, vomiting, and diarrhea." Those are the very signs on the warning list above.

Any dose or taper change belongs to the prescribing veterinarian. If that clinic is closed, its after-hours line or an in-person emergency vet is the right contact for a change. Until a veterinarian says otherwise, the schedule stays as written.

Things that make the panting worse or more dangerous

Two things about the medication itself. VCA says, "Give this medication with food." And do not pair prednisone with an NSAID such as carprofen unless the prescribing veterinarian planned the combination, because Merck Veterinary Manual notes that glucocorticoids "potentiate the ulcerogenic effects of NSAIDs."

Then the things a veterinarian weighs, not diagnoses. Hot rooms and heavy exercise add heat a steroid-panting dog has to shed. Anxiety adds panting of its own. Heart or airway disease leaves less reserve; a vet rules those out; they are not a verdict on your dog tonight. VCA's Steroid Treatment page also notes that steroids can bring on or worsen infections, especially bacterial skin infections, so panting plus a fever or a new skin infection needs a vet look.

What to do tonight while you watch

If none of the red flags are present, the job tonight with a dog panting on prednisone is to keep it comfortable and gather what a veterinarian will ask for.

A cool, dim, quiet room.
Fresh, cool water always available. A dog on steroids is thirsty for a reason; do not limit it.
Short, quiet potty breaks instead of a long walk; a dog drinking more will need to go out more.
No extra pills of any kind: no antihistamine, no human pain reliever, nothing left over from another pet, and no change to the prednisone.
Check gum color (pink is what you want) and watch breathing effort: fast is expected, whole-body effort is not.
Write down when the panting started, when the last dose was given and which day of the course this is.
Film 20 seconds of the breathing with the sound on, close enough to see the chest and the gums.

What a RexVet online vet can and cannot do for a dog panting on steroids

On a video visit, a RexVet veterinarian can watch breathing effort and rate on camera and look at gum color. The vet reviews why the prednisone was prescribed, the dose the clinic set and the day of the course, says whether the panting looks like the expected side effect for that picture, coaches overnight monitoring and tells you plainly if you need the ER. RexVet's page on online vet medication side-effect review explains how those visits work.

What a video visit cannot do: feel the belly, take a temperature, run bloodwork, treat heatstroke or give oxygen. It does not change the taper set by the prescribing veterinarian. If the veterinarian decides medication is appropriate, they can prescribe where state rules allow; under Florida Statutes 474.2021, a prescription based solely on a telehealth evaluation is limited to 14 days of treatment for most animal drugs and may not be renewed without an in-person examination.

RexVet's veterinarians are licensed in Florida, New York and Virginia; see the online vet in Florida, online vet in New York and online vet in Virginia pages.

If your dog is panting but bright, eating, with pink gums and none of the red flags, you can book a RexVet video visit now for $64.99 if your dog is in Florida, New York or Virginia. RexVet's veterinarians are licensed in those three states only and are available 24/7. It is triage, not a prescription.

When it must be in person

None of these can wait. Go to an in-person emergency vet now for:

Collapse, or a dog that cannot stand
Pale or blue gums
Real struggling to breathe, or labored breathing that persists at rest
Bloody vomit or black stools
A seizure
A swollen or painful belly
Suspected heatstroke: a dog that got hot outside and cannot settle
Panting that is getting worse hour by hour
A puppy or a senior dog that has stopped eating
A dog with known heart disease whose breathing or strength is declining

The ER is the right call regardless of cost or hour. A video visit cannot treat any of these.

If you have no red flags but need expert peace of mind tonight, you can book a RexVet video visit now for $64.99 if your dog is in Florida, New York or Virginia. RexVet's veterinarians are licensed in those three states only and are available 24/7, and the visit is a read on the panting, not a prescription.

Frequently asked questions

Does prednisone make dogs pant?

Yes. Panting is a common side effect of prednisone and prednisolone, listed by VCA and the American Kennel Club, and it usually shows up with increased thirst, urination and appetite. Panting plus weakness, vomiting, diarrhea, pale gums or labored breathing is the warning sign.

How long does panting last on prednisone?

There is no fixed number. Panting often tracks the dose and tends to ease as the course is tapered down and ends; the prescribing veterinarian can say what to expect for your dog.

Should I skip a dose if my dog is panting a lot on prednisone?

No. Do not skip, halve or stop a dose on your own; any dose or taper change belongs to the prescribing veterinarian. If that clinic is closed, its after-hours line, an emergency vet or a video visit can triage tonight, but the pills stay exactly as prescribed until a veterinarian says otherwise.

Why is my dog panting at night on prednisone?

The house is quiet, so the restlessness and thirst that steroids cause are easier to notice. Give fresh water and a cool, quiet resting spot. If your dog cannot settle for hours or seems distressed, get a vet look; if any of the red flags above are present, that means an in-person emergency vet, not a video call.

Can an online vet tell if my dog's panting on prednisone is serious?

Often, yes. On camera a RexVet veterinarian can judge breathing rate and effort and read the panting against why the drug was prescribed, the dose the clinic set and the day of the course, then tell you whether this is the expected side effect or an ER trip. A RexVet video visit cannot feel the belly, run bloodwork or treat heatstroke, and the taper stays with the prescribing clinic.