Top 5 situations in which you should reconsider antibiotics for dogs and cats – Responsible antibiotic use

Inspired by: Dr. Jennifer Granick, DVM, MS, PhD, DACVIM (SAIM), University of Minnesota

Antibiotics are undoubtedly among the most important achievements of modern medicine – including in veterinary medicine. They enable the successful treatment of bacterial infections that were often life-threatening in the past. However, as in human medicine, the overuse or indiscriminate use of antibiotics can have far-reaching negative consequences – both for the individual animal and for the animal population as a whole. Side effects such as gastrointestinal problems are only part of the issue. Far more serious is the increasing development of resistant bacteria, against which hardly any antibiotic will eventually be effective. Therefore, it is more important than ever to decide on the administration of antibiotics consciously and judiciously.

In many cases – especially mild or self-limiting illnesses – treatment can be replaced by careful observation, supportive measures, and open communication with pet owners. The following five situations are among the most common where antibiotic therapy seems intuitively appropriate, but is not necessary upon closer examination.

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1. Feline upper respiratory infection without evidence of systemic disease

A typical scenario in small animal practice: A cat is presented with sneezing fits, watery eyes, and clear nasal discharge. For many pet owners, this is already cause for concern – understandably so, as the symptoms are unpleasant and often seem more serious than they actually are. In most cases, however, it is a viral infection of the upper respiratory tract, usually caused by feline herpesvirus (FHV-1) or calicivirus. These infections are widespread, highly contagious, but generally self-limiting – meaning they clear up on their own within about ten days without specific drug treatment.

Antibiotics are ineffective against viruses. Therefore, their use is not only ineffective in purely viral illnesses, but can also be harmful – for example, by disrupting the gut flora, causing loss of appetite, or leading to antibiotic resistance. It is much more important to provide targeted support for the cat. This includes humidifying the air (e.g., with a humidifier or hot water in the shower), gently removing nasal and eye secretions, and implementing stress-reducing measures such as providing hiding places or using pheromones.

Since cats rely heavily on their sense of smell for food, a blocked nose can significantly reduce their appetite. Aromatic, warmed wet food or small portions of particularly tasty treats can help. If the cat's appetite remains absent, appetite-stimulating medications such as mirtazapine may be helpful. Further diagnostic testing, including a PCR test and possibly antibiotic therapy, is only indicated if the symptoms persist for more than ten days, the animal becomes lethargic, or even develops respiratory distress.

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2. Kennel cough in dogs – without signs of pneumonia

Kennel cough, medically known as Canine Infectious Respiratory Disease Complex (CIRDC), is a common cause of acute coughing in dogs. The disease is highly contagious and is caused by various viruses and bacteria, including parainfluenza virus, adenovirus, Bordetella bronchiseptica, and mycoplasma. In most cases, the illness is mild and is perceived by pet owners as bothersome but not life-threatening.

A characteristic symptom is a sudden, dry cough, often triggered by excitement or exercise. A slight nasal discharge may also occur. The good news is that most affected dogs show no impairment of their general health – they eat normally, play, and are active. This mild form of the disease usually does not require antibiotic treatment. The symptoms typically subside spontaneously within seven to ten days.

Only if fever, unusual fatigue, or loss of appetite are also present can a bacterial component be suspected. In such cases, targeted antibiotic treatment may be indicated. Even then, it is crucial to assess the animal's overall condition and not react solely to the symptom of coughing. For a dry, non-productive cough, a cough suppressant can help provide the animal with greater comfort.

In Veterinary practices When multiple practitioners are involved, differing opinions on treatment can arise. A standardized, practice-wide approach fosters trust among pet owners and avoids misunderstandings.

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3. Subclinical bacteriuria – When bacteria do not cause illness

Bacteria in urine do not automatically mean that a urinary tract infection (UTI) is present. Only when typical symptoms such as pain during urination, frequent passing of small amounts of urine (pollakiuria), blood in the urine, or stranguria (difficulty passing urine) are also present is it considered an infection requiring treatment. The detection of bacteria in a urine culture without any clinical symptoms, on the other hand, is called subclinical bacteriuria – and usually does not require treatment.

This form is not uncommon: Up to 12 of healthy dogs and 13 of healthy cats exhibit subclinical bacteriuria – without experiencing any adverse effects. The frequency also increases significantly in animals with chronic kidney disease. Studies show that antibiotic treatment of such animals offers no demonstrable benefit – neither in terms of quality of life nor life expectancy.

On the contrary, the unnecessary use of antibiotics promotes resistance and can disrupt the body's delicate bacterial balance. In human medicine, subclinical bacteriuria is treated only in exceptional cases—for example, in pregnant women or patients before urological procedures. This cautious approach should also become the norm in veterinary medicine.

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4. Acute diarrhea – less is often more

Diarrhea is one of the most common reasons for veterinary visits to small animal practices. It is usually acute, self-limiting, and has a variety of causes – from dietary errors and stress to viral infections. Nevertheless, many animals are prematurely prescribed antibiotics such as metronidazole – even though numerous studies show that these medications are ineffective in most cases.

For example, studies have shown that metronidazole does not shorten the duration of diarrhea – compared to a placebo or dietary measures alone. On the contrary, antibiotics can significantly damage healthy gut flora, causing dysbiosis, which can last longer and even delay the healing process.

The better alternative? A bland, easily digestible diet, possibly combined with probiotics, often offers the most effective and gentle path to recovery. Even in cases of bloody diarrhea—such as acute hemorrhagic diarrhea syndrome (AHDS)—it has been shown that dogs without systemic symptoms (e.g., fever, lethargy, signs of sepsis) do not require antibiotic therapy. Antibiotics are only justified in severely weakened patients or in cases of bacterial translocation (e.g., a degenerative left shift in the blood count).

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5. Positive Lyme disease serology in healthy dogs

In areas with a high risk of Lyme disease, a positive antibody test in dogs is not uncommon – but only a very small percentage of these animals actually develop clinical symptoms. Mere seropositivity simply means that the dog has come into contact with the pathogen at some point. Borrelia burgdorferi He had – not that he is ill or will become ill. Studies show that only about 5% of % seropositive dogs develop clinical signs such as lameness or fever.

Even rarer – but feared – is Lyme nephritis, an immune-mediated kidney disease. Nevertheless, it is important not to start treatment prematurely in healthy, asymptomatic dogs. Doxycycline, the preferred antibiotic for Lyme disease, can cause side effects such as loss of appetite, vomiting, and, in rare cases, liver damage – and should therefore not be used lightly.

International guidelines therefore clearly recommend that dogs without symptoms and without proteinuria in their urine do not require treatment – even if serology is positive. Therapy in such cases offers no proven benefit and can even pose risks. Instead, these animals should be examined regularly and monitored for any signs of illness – without unnecessarily burdening them with medication.

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Frequently asked questions about responsible antibiotic use:

Summary: Responsible use of antibiotics in dogs and cats

The responsible use of antibiotics This is a central concern of modern veterinary medicine. In times of increasing antibiotic resistance, it is becoming ever more apparent that every use of antibiotics must be well-considered and justified. responsible use of antibiotics This does not mean foregoing life-saving medications – but rather using them selectively and judiciously where they are truly necessary.

A responsible use of antibiotics It begins with careful diagnosis: Antibiotic treatment should only be considered if a bacterial infection is definitively diagnosed or highly likely. It is crucial not to be guided by expectations or routines, but to evaluate each case individually – a cornerstone of the responsible use of antibiotics.

Many illnesses, such as viral respiratory infections in cats or acute diarrhea in dogs, do not require antibiotics. Patience is key here – as is the willingness to implement supportive measures. This conscious decision to forgo antibiotics is not negligence, but rather an expression of high-quality medical care: it, too, is part of the process. responsible use of antibiotics.

An important aspect of the responsible use of antibiotics Open communication with pet owners is key. Explaining why antibiotics are not given in certain situations fosters understanding and trust. It also helps to clarify risks such as side effects, intestinal flora disruption, or the development of resistance – all aspects that must be addressed within the context of... responsible use of antibiotics play a role.

The responsible use of antibiotics This also includes choosing the right medication, the appropriate dose, and the optimal duration. Treatment that is too short or too long can be just as problematic as using a broad-spectrum antibiotic without identifying the specific pathogen. This is where the intricacies of... responsible use of antibiotics in daily practice.

This also includes avoiding unnecessary reserve antibiotics. These particularly effective drugs should be reserved for serious cases – a basic principle for the responsible use of antibiotics worldwide. At the same time, the effectiveness should be regularly checked through resistance tests to ensure the responsible use of antibiotics to ensure long-term sustainability.

Another building block for the responsible use of antibiotics The training of the practice team is crucial. Only those who are informed about the latest recommendations and act consistently can achieve the desired results. responsible use of antibiotics Implement this in everyday practice. A coordinated approach is essential, especially in practices with multiple practitioners.

Last but not least, aftercare is also an important component. responsible use of antibiotics It doesn't end with the last tablet – but also includes monitoring the healing process, a follow-up examination if necessary, and careful documentation.

Overall, it becomes clear: The responsible use of antibiotics It is a comprehensive process that requires knowledge, experience, communication, and consistency. Veterinarians, veterinary technicians, and pet owners are all involved. Only when everyone works together can a sustainable and... responsible use of antibiotics – for the well-being of the individual animal, the entire animal population, and human health.

The responsible use of antibiotics It is therefore more than a medical decision – it is an ethical imperative. Those who take it seriously protect not only today, but also the medical possibilities of tomorrow. That is why it is important to... responsible use of antibiotics to continually bring this to mind, reflect on it, and develop it further. The future of animal health depends significantly on how we act today – and how consistently we adhere to the principles of animal health. responsible use of antibiotics live in practice.

Responsible use of antibiotics is not an option, but a necessity.
Responsible use of antibiotics It begins with knowledge – and ends with impact.
Responsible use of antibiotics It not only saves lives – it also preserves them.