When your dog is sick, it can be a stressful experience. A dog cold — also known as an upper respiratory infection or canine cold — is one of the most common respiratory problems in dogs, especially during the colder months. Although people sometimes refer to it as “dog flu,” in most cases it is a mild infection of the upper airways that, with the right care, resolves without complications. At Veterinari del Clínic, we explain everything you need to know: causes, symptoms, treatment, and when to visit the vet.
Can Dogs Get Colds?
Yes, dogs can get colds. Just like humans, they are susceptible to upper respiratory tract infections that produce symptoms very similar to a common cold. A dog cold is usually caused by viruses and bacteria specific to the canine species, such as the canine parainfluenza virus or the bacterium Bordetella bronchiseptica.
A dog is more likely to catch a cold in winter, after sudden temperature changes, or when its immune system is weakened. Small breeds, puppies, and senior dogs are particularly vulnerable. If your dog catches a cold, there is no need to panic, but it is important to monitor the symptoms and consult your vet if there is no improvement within a few days.
Why Do Dogs Get Colds?
Dog colds, clinically known as infectious canine tracheobronchitis, can be caused by the canine parainfluenza virus and the bacterium Bordetella bronchiseptica. The disease spreads through respiratory droplets in crowded places such as parks or kennels, which is why it is also known as kennel cough.
Other factors that predispose dogs to upper respiratory infections include sudden temperature changes, high environmental humidity, stress — for example, after a stay at a boarding kennel — and a weakened immune system.
Is a Dog Cold Contagious?
A canine cold is contagious between dogs. It spreads through direct contact (nose to nose), through droplets released when coughing or sneezing, and through shared water bowls or toys. If your dog has a cold, it is advisable to keep it away from other dogs until the symptoms have cleared.
However, human colds cannot be passed to dogs, and vice versa. The viruses that cause colds in people (such as rhinoviruses) are different from those that affect dogs. If you have a cold yourself, you can rest assured — you will not give it to your dog.
Dog Cold Symptoms
The symptoms of a dog cold are similar to those we experience when we have a cold. The most common signs are:
- Persistent cough: can be dry or productive, and tends to worsen with exercise or excitement.
- Frequent sneezing: if your dog is sneezing a lot and repeatedly, it may indicate irritation of the upper airways.
- Nasal discharge: clear or slightly cloudy mucus. If the discharge becomes thick, yellow, or green, it could indicate a secondary bacterial infection.
- Fever: a dog’s normal temperature ranges between 38 °C and 39 °C (100.4–102.2 °F). Above 39.5 °C (103.1 °F) is considered a fever.
- Lethargy: your dog may seem more withdrawn, with less interest in playing or going for walks.
Other signs that can accompany a dog cold include loss of appetite, watery eyes, and slightly noisier breathing than usual.
Colds in Puppies: Is It More Serious?
Puppies are more vulnerable to colds because their immune system is not yet fully developed. A cold that resolves on its own in a few days in an adult dog can more easily lead to complications in a puppy, such as bronchitis or pneumonia.
If your puppy shows sneezing, nasal discharge, or coughing, it is important to visit the vet without delay. In puppies under three months of age, any respiratory symptom should be assessed urgently to rule out more serious diseases such as canine distemper.
How to Tell If Your Dog Has a Cold
If you suspect your dog may have a cold, watch for several of these signs occurring at the same time:
- Repeated sneezing throughout the day — not just an isolated sneeze.
- Nasal discharge that is clear and continuous.
- Coughing that appears mainly when waking up, drinking water, or after exercise.
- Reduced activity: your dog sleeps more than usual or shows less interest in walks.
- Watery eyes or mild redness.
A single isolated symptom does not always mean your dog has a cold. But if your dog combines coughing, sneezing, and lethargy for more than 24–48 hours, it is likely that it has an upper respiratory infection and should be seen by a vet.
Dog Cold or Distemper? How to Tell the Difference
The early symptoms of canine distemper can easily be confused with a common cold, since both start with nasal discharge, a mild cough, and fever. However, distemper is a far more serious disease that requires immediate veterinary attention.
Signs that may indicate distemper rather than a simple cold:
- Nasal discharge becomes thick and purulent (yellow or green) within a few days.
- Digestive symptoms appear: vomiting and diarrhoea.
- Neurological signs are observed: tremors, seizures, involuntary movements, or loss of coordination.
- The paw pads harden (hyperkeratosis).
- The dog is unvaccinated or has an incomplete vaccination schedule.
A common cold usually resolves within one to two weeks with basic care, whereas distemper progressively worsens and can affect the dog’s nervous system. If in doubt, contact your vet so that the necessary diagnostic tests can be carried out. Vaccination is the most effective way to protect your dog against distemper.
How to Treat a Dog Cold
Most dog colds are mild and resolve within one to two weeks with appropriate care. The most important treatment guidelines are:
- Isolation: keep your dog away from other dogs to prevent the spread of infection.
- Vet visit: consult your vet so that your dog can be properly assessed. If there is a secondary bacterial infection, antibiotics may be needed.
- Rest and care: provide your dog with a warm, quiet place to rest, and make sure it drinks enough water to stay well hydrated.
- Vaccination: the best way to tackle dog colds is to prevent them. Keeping the vaccination schedule up to date — including the kennel cough vaccine — significantly reduces the risk.
Important: never give your dog human medications — such as paracetamol or ibuprofen — without veterinary advice. Many human medicines are toxic to dogs, even in small doses.
What to Do If Your Dog Has a Cold
If you notice that your dog has a cold, follow these steps:
- Monitor the symptoms for the first 24–48 hours. A mild cold may improve with rest and hydration alone.
- Keep your dog in a warm environment and avoid long walks on very cold or rainy days until it has recovered.
- Make sure your dog stays hydrated: offer fresh water frequently. If your dog eats dry kibble, you can slightly moisten it to make eating easier.
- Avoid contact with other dogs to prevent spreading the infection.
- See your vet if symptoms do not improve within 2–3 days, if your dog develops a high fever, if the nasal discharge becomes thick or discoloured, or if your dog stops eating.
With the right treatment and the necessary precautions, most dogs recover fully from a cold within a few days. At Veterinari del Clínic, we are here to answer any questions you may have about your companion’s health.
