Streptococcus

When are streptococci really dangerous for dogs?

Streptococci are part of the normal flora – they live on the skin and in the respiratory tracts of most dogs without ever causing issues. This changes abruptly as soon as an entry point is created. A small cut on a paw pad, which you hardly take seriously, can become inflamed within hours. A cold that sounds like kennel cough occasionally turns into pneumonia. Particularly beta-haemolytic streptococci – above all Streptococcus canis – manage to turn a superficial skin injury into a systemic infection.

The bacteria only need one weak point: bite wounds after fights, scratched areas in dogs with allergies, irritated airways after kennel cough outbreaks. In a robust, healthy dog, this usually remains without consequences. It looks different if the animal has just been operated on, suffers from a chronic illness or the immune system is low for other reasons – then the same germs can spread within a very short time.

How do I recognise a streptococcal infection?

The first sign is usually a wound that simply will not heal – or even worsens. Instead of scabbing over, it becomes red, swells up and starts oozing. The dog obsessively licks at it or flinches when you touch the area. With skin infections, an unpleasantly sweet smell is often noticeable.

Respiratory tract infections progress differently. Initially, there is a dry cough, which becomes wet and productive after one or two days. The nasal discharge changes from clear to yellowish. Fever tends to rise in the evening – you notice this because the nose is very warm and the dog suddenly seeks out cool tiles. Loss of appetite and lethargy usually follow with some delay, so not immediately on the first day.

Ear infections have their own symptom language: The dog shakes its head unusually often, the ear feels hot and smells musty-sweet. Sometimes you can hear a squelching sound when touching it – that sounds strange, but anyone who has heard it once will recognise it immediately. Some dogs fold the affected ear back or carry their head permanently tilted.

When does it become an emergency?

The insidious thing about streptococcal infections is the speed. A local inflammation can turn into sepsis within a few hours. Clear warning signs: sudden high fever above 40 °C, pale or bluish discoloured mucous membranes, heavy breathing. The dog appears apathetic, refuses food and may vomit.

It becomes particularly serious if the pulse is racing fast but remains weak at the same time – and the limbs feel cold while the body itself is hot. This combination is a warning signal that does not tolerate an hour of waiting time. Go to the vet immediately or – outside opening hours – to the nearest veterinary clinic.

How does the diagnosis work?

The vet first takes a swab – directly from the wound, nose or throat, depending on where the suspicion lies. In the lab, it usually takes 24 to 48 hours until it is clear whether streptococci are the culprit.

This is almost always accompanied by a blood test: Elevated white blood cells indicate a bacterial infection. If sepsis is suspected, the vet additionally measures inflammation markers such as C-reactive protein. If the lungs could be involved, X-rays are taken – these help assess how far advanced the infection already is.

Which antibiotics help?

Streptococci usually respond well to penicillin, which is often the first remedy the vet reaches for. In severe infections, they combine amoxicillin with clavulanic acid to also catch resistant strains. Treatment lasts at least seven days – often longer.

A classic mistake: stopping the antibiotic as soon as the dog seems lively again. This is understandable, but risky. Streptococci that have not been completely eliminated can return – and be more resistant next time. Completing the full course is no small feat, but it is worth it.

In severe skin infections, antibiotics alone are often not enough. The vet cleans the wound, removes dead tissue, opens and flushes abscesses. Without this mechanical component, you won’t get far with tablets alone.

Can a streptococcal infection be prevented?

The most important measure is so simple that it is easily underestimated: treat wounds immediately. Clean cuts and bite marks with clear water, keep them clean – and go to the vet for deeper injuries, even if they look harmless. This is always worth it after fights.

Dogs with skin allergies or recurring ear problems carry an increased risk of infection. If you treat the underlying condition consistently, you also reduce susceptibility to streptococci. During cold season, avoid overcrowded dog schools or group accommodations if the dog already seems run down.

The strongest shield is ultimately an intact immune system. Chronic stress weakens defences – relaxed dogs are less likely to catch infections and develop serious secondary bacterial infections. This sounds almost too simple, but it is well documented in practice.