Antibiotics for Dogs & Cats Explained

Antibiotics can play an important role in treating bacterial infections in pets, but they are not the right answer for every illness. As pet owners, it can be worrying if your dog or cat is unwell and your veterinary surgeon mentions antibiotics, or just as confusing if they explain that antibiotics are not needed.

In this guide, we explain how antibiotics work in dogs and cats, when they may be prescribed, why responsible use matters, and what you should know before giving them at home. We also cover when to contact your veterinary surgeon and how we can help at Vetscriptions if your pet has been prescribed medication.

This article is intended for general guidance only and should not replace professional veterinary advice. If your pet is unwell or showing concerning symptoms, please contact your veterinary surgeon.

What are antibiotics?

Antibiotics are medicines used to treat infections caused by bacteria. Bacteria are tiny living organisms that can sometimes cause illness, such as skin infections, wound infections, urinary infections, or certain respiratory infections.

Antibiotics work by either killing bacteria or stopping them from multiplying, giving your pet’s immune system a better chance to clear the infection.

They do not work against viruses. This means antibiotics will not help with every cough, sneeze, upset stomach, or general illness. In some cases, supportive care, rest, or other types of treatment may be more appropriate.

When might a dog or cat need antibiotics?

Your veterinary surgeon may prescribe antibiotics if they believe your pet has a bacterial infection. This decision is based on your pet’s symptoms, examination findings, medical history, and sometimes laboratory testing.

Common situations where antibiotics may be used

• Skin infections, including infected wounds or abscesses
• Urinary tract infections
• Dental infections
• Ear infections caused by bacteria
• Certain eye infections
• Respiratory infections where bacteria are involved
• Post-operative infections or infection risk in specific cases

Some pets, especially cats, can develop abscesses after bites or scratches. Dogs may be prescribed antibiotics after certain skin problems, injuries, or infections linked to allergies. However, each case is different, and the most suitable treatment depends on the underlying cause.

When antibiotics are not usually needed

Not every illness needs antibiotics. In fact, avoiding unnecessary antibiotics is an important part of good pet care.

Antibiotics are not usually helpful for:

• Viral infections
• Many cases of mild diarrhoea or vomiting
• Allergies without infection
• Inflammation that is not caused by bacteria
• Routine coughs or colds where bacteria are not involved

If your veterinary surgeon does not prescribe antibiotics, that does not mean your pet’s illness is being ignored. It often means they are using the most appropriate and responsible treatment plan for your pet.

Why responsible antibiotic use matters

Responsible antibiotic use is important in both human and veterinary medicine. One of the main concerns is antibiotic resistance. This happens when bacteria change over time and become harder to treat with the medicines that once worked well.

If antibiotics are used too often, used incorrectly, or given when they are not needed, resistant bacteria may develop. This can make future infections harder to treat in pets and, more broadly, can contribute to a wider public health problem.

How pet owners can help

• Only give antibiotics that have been prescribed for your pet by a veterinary professional
• Follow the dose and timing instructions carefully
• Complete the full course if advised to do so
• Never share antibiotics between pets
• Never use leftover medication without veterinary advice
• Speak to your veterinary surgeon if your pet is not improving or has side effects

Using antibiotics properly helps protect your pet and supports responsible treatment for all animals.

How antibiotics are given to pets

Antibiotics come in different forms depending on the type of infection, the pet being treated, and how easy the medicine is to give.

Common forms of antibiotics

• Tablets or capsules
• Oral liquids
• Topical creams, drops, or sprays
• Ear drops
• Eye drops or ointments
• Injections given by a veterinary surgeon

Some pets take tablets easily, while others may need liquid medication or a different form of treatment. If you struggle to give medication, ask your veterinary practice for advice. Clear instructions can make treatment much less stressful for both you and your pet.

If your dog or cat has been prescribed medication, you can also read our guide to ordering a prescription medicine and browse our prescription medicines for convenient access to vet-prescribed treatments.

What to expect when your pet is on antibiotics

Once treatment starts, some pets begin to improve within a few days, but it is important not to stop early unless your veterinary surgeon advises it. Stopping too soon may allow some bacteria to survive, which can lead to the infection returning.

Helpful tips during treatment

• Give each dose at the correct time
• Use food only if your veterinary surgeon or label instructions recommend it
• Store the medicine correctly
• Keep a note of when doses are given
• Watch for improvement or any side effects

Common side effects can include mild tummy upset, such as vomiting or diarrhoea, but not all pets experience this. If your pet seems very unwell, develops swelling, difficulty breathing, severe diarrhoea, or anything else that concerns you, contact your veterinary surgeon promptly.

What if you miss a dose?

If you miss a dose, follow the instructions given by your veterinary surgeon or the medicine label. In many cases, you should give the missed dose when you remember, unless it is nearly time for the next one. Do not give a double dose unless you have been specifically told to do so.

If you are unsure, it is always safest to check with your veterinary practice.

Can you use human antibiotics for pets?

No, you should never give your dog, cat, or small pet human antibiotics unless a veterinary surgeon has specifically instructed you to do so. Some human medicines can be harmful or even toxic to pets, and even antibiotics that are sometimes used in animals must be prescribed at the right dose and for the right condition.

Giving the wrong medicine may delay proper treatment, worsen illness, or increase the risk of side effects and resistance.

Antibiotics for small pets

Small pets such as rabbits, guinea pigs, hamsters, and other small animals can also need antibiotics, but extra care is needed. Some antibiotics are not suitable for certain species, particularly rabbits and guinea pigs, because they can upset the normal bacteria in the gut and cause serious illness.

If you own a rabbit or other small pet, never give antibiotics without veterinary advice. If prescribed, follow the treatment plan very carefully. You can also explore our small animal collection for other species-specific products and healthcare support.

When should you contact a veterinary surgeon?

It is important to seek veterinary advice if your pet has symptoms that could suggest an infection or if they are not responding as expected to treatment.

Contact your veterinary surgeon if your pet:

• Has a wound, swelling, or discharge
• Is straining to urinate or urinating more often than usual
• Has ongoing coughing, sneezing, or breathing changes
• Seems painful, lethargic, or off their food
• Has an ear that is sore, smelly, or full of discharge
• Develops vomiting, diarrhoea, or other side effects while on medication
• Does not improve after starting antibiotics

Ear, eye, skin, urinary, and dental problems can sometimes worsen quickly, so early advice is always best. For ongoing healthcare support, you may find our collections for dog ear products, cat ear products, dog eye products, and cat eye products helpful where recommended by your veterinary surgeon.

How Vetscriptions can help

At Vetscriptions, we help UK pet owners access genuine prescription medications and everyday pet healthcare products with confidence. If your veterinary surgeon has prescribed antibiotics or another treatment, we can help make the ordering process simple and straightforward.

You can learn more through our prescription FAQs, complete our animal health form where needed, or contact us if you need support with your order.

For pet owners looking after broader health needs, we also offer dedicated ranges for dogs, cats, and preventative care products such as our flea, tick and worming collection.

Final thoughts on antibiotics for pets

Antibiotics are valuable medicines when they are used appropriately, but they are only one part of good pet healthcare. The key is making sure your pet receives the right treatment, for the right condition, at the right time.

If your dog, cat, or small pet has been prescribed antibiotics, follow your veterinary surgeon’s instructions carefully and complete the treatment exactly as advised. If your pet’s condition changes or you are unsure about anything, do not hesitate to ask for professional advice.

At Vetscriptions, we are here to support you with trusted information, genuine pet medications, and a simple way to order prescribed treatments responsibly. You can explore our prescription medicine range, visit our about us page to learn more about who we are, or speak to your veterinary surgeon for tailored advice about your pet’s health.

Looking after a pet can feel overwhelming at times, but with the right guidance and timely treatment, you can help them stay as comfortable and well as possible.