You glance over at your dog and they're panting. Mouth open, tongue out, sides heaving a little. Normal, right?
Usually, yes. But panting is actually your dog's way of communicating several very different things, and reading it correctly can make a real difference in their comfort and health, especially in summer.
Here's a practical guide to what's going on behind that open mouth.
☀️ Panting from Heat
This is the most common kind, and the one most of us know. Dogs don't sweat the way humans do. Panting is their primary cooling mechanism. As air moves over the tongue and through the airways, moisture evaporates and pulls heat away from the body.
The catch: it has limits. High humidity slows evaporation, which means panting becomes less effective exactly when your dog needs it most. On a muggy 85°F afternoon, a dog can be working much harder than you'd guess from looking at them.
If it's 86°F outside, the asphalt under your dog's feet can be pushing 135°F. The heat load on their body is significant before you've even thought about it.
Signs heat panting has crossed a line:
- Panting is loud, labored, or frantic rather than steady
- Gums look bright red, or in severe cases, pale or bluish
- Excessive drooling, especially thick or stringy saliva
- Seeking shade, lying down, and won't get up
- Vomiting, stumbling, or seeming confused
If you see two or more of those together, move to shade, offer small amounts of cool (not cold) water, and apply cool water to the paw pads and neck. If they don't improve within a few minutes, call your vet. Heatstroke can progress to organ failure in under 30 minutes.
⚡ Panting from Anxiety
This one surprises a lot of pet parents, because anxiety panting looks almost identical to heat panting. The difference is context.
If your dog is panting in an air-conditioned room, or starts panting the moment you pick up your car keys, or begins doing it as a thunderstorm builds in the distance, heat is probably not the culprit. That's their nervous system doing the work.
Anxiety panting often comes with other tells: yawning, lip-licking, pacing, tucked tail, or refusing treats they'd normally inhale. Some dogs develop it specifically around fireworks, vet visits, car rides, or new environments.
Anxiety panting clues:
- Starts in a cool room or indoors with no activity
- Triggered by a specific event: fireworks, car, strangers
- Comes with pacing, trembling, or clingy behavior
- Your dog can't settle even when physically still
- Disappears once the trigger is gone
For situational anxiety, the best support is usually a calm environment, predictable routine, and, for ongoing cases, a conversation with your vet about whether a natural wellness supplement makes sense.
🩺 Panting That's Neither
This is the category worth knowing about, because it's easiest to miss.
Heavy or persistent panting can also signal pain, respiratory issues, hormonal changes like Cushing's disease, or medication side effects. If your dog is panting regularly and you can't connect it to heat or an obvious stressor, and especially if it's new behavior, that's worth a vet visit.
A dog in pain will often pant even at rest. If they're also moving stiffly, reluctant to lie down in their usual spot, or just seem "off," don't wait to get it checked.
✅ The Short Version
- Heat panting: after activity or in warm conditions — resolves with cool water and rest
- Anxiety panting: triggered by specific situations, comes with nervous behavior
- Medical panting: no obvious cause, new behavior, or at rest — see your vet
Knowing the difference means you can respond instead of guess. And it means you're already doing something most pet parents don't: paying close attention to the small signals.