How Antibiotics Work And What The Side Effects Are In Dogs


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It’s no secret that antibiotics have saved countless lives since they were first introduced in the 1920s. But how do they work? And are there any side effects we should be aware of before giving them to our beloved furry friends? In this blog post, we’ll explore how antibiotics work and what the most common side effects are in dogs. We’ll also provide some tips on when and how to use them safely. So if you’re ever wondering whether or not to give your dog antibiotics, this is the post for you.

What are antibiotics?

Antibiotics are a type of medication used to treat bacterial infections. They work by killing the bacteria or preventing them from growing.

There are many different types of antibiotics available, and they can be given orally (by mouth), intravenously (through a vein), or topically (on the skin). Antibiotics can also be given as injections.

Common side effects of antibiotics include diarrhea, vomiting, and loss of appetite. More serious side effects can occur, but these are rare. If your dog experiences any side effects, please contact your veterinarian immediately.

How do antibiotics work?

There are two ways that antibiotics can work in dogs: by killing bacteria or by stopping bacteria from multiplying. Antibiotics that kill bacteria are called bactericidal, while those that stop bacteria from multiplying are called bacteriostatic.

Most antibiotics used to treat infections in dogs are bactericidal. This means they work by killing the bacteria that is causing the infection. For example, penicillin and amoxicillin are both bactericidal antibiotics.

Bacteriostatic antibiotics work by stopping the bacteria from multiplying. This gives the body time to fight off the infection on its own. Tetracycline is an example of a bacteriostatic antibiotic.

What are the side effects of antibiotics in dogs?

The side effects of antibiotics in dogs are typically mild and may include diarrhea, vomiting, decreased appetite, and itchiness. More serious side effects are rare, but can include allergic reactions, kidney damage, and gastrointestinal problems. If your dog experiences any of these side effects, contact your veterinarian immediately.

When should you give your dog antibiotics?

Most dog owners are aware that their furry friends can sometimes need antibiotics, but they may not know when to give them. Here is a general guide:

If your dog has a bacterial infection, your vet will likely prescribe antibiotics. These medications can be given orally or intravenously (through the vein). The most common oral antibiotics used in dogs include cephalexin, amoxicillin-clavulanate, and enrofloxacin.

Bacterial infections usually respond well to antibiotic therapy, but it is important to give the full course of medication as prescribed by your veterinarian. Stopping too early can allow the bacteria to become resistant to the antibiotic, which makes future treatment more difficult.

Side effects from antibiotics are generally rare in dogs, but may include vomiting, diarrhea, and decreased appetite. If you notice any of these side effects, please contact your veterinarian.


Antibiotics are an important tool in keeping dogs healthy, but it’s important to be aware of the potential side effects. The most common side effect of antibiotics is gastrointestinal upset, which can lead to diarrhea or vomiting. If your dog experiences these symptoms, be sure to contact your veterinarian. Other potential side effects include allergic reactions and kidney damage, so it’s important to closely monitor your dog while they’re taking antibiotics. With proper care, your dog should recover quickly and without any complications.


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