Side Effects of Antibiotics in Dogs

Antibiotics are used to treat a variety of infections and diseases in dogs. They work by killing or inhibiting the growth of bacteria and other microbes. The most common side effects associated with antibiotics in dogs include: nausea and vomiting, diarrhea, anaphylaxis, blood in stool, and bacterial resistance.

Because there are so many different types of antibiotics, it’s important to discuss with your veterinarian which ones you can use without causing any serious side effects for your dog.

Your vet can help determine the best course of antibiotic treatment based on the type of infection and other factors such as:

  • The breed of your dog (some breeds are more susceptible to side effects than others)
  • The age of your dog (older dogs are more likely to experience side effects from certain antibiotics)
  • Whether or not you have an intact male or female canine companion

Antibiotics for dogs can cause side effects just as they do in humans.

  • Not all antibiotics are necessary, and some are more likely to cause side effects than others.
  • Side effects may be mild or severe and may include diarrhea, vomiting, allergic reactions, upset stomach and skin rashes. They can also include life-threatening conditions such as anaphylaxis (a severe allergic reaction).
  • Side effects usually go away on their own once you stop taking the antibiotic. But if they don’t improve after stopping the medication, talk with your veterinarian about other treatments available to help you feel better sooner rather than later!

Some of the most common side effects include nausea and vomiting.

If your dog experiences these side effects, it is important to bring him or her in for a veterinary examination, because they could signal a more serious problem. If your dog is experiencing nausea or vomiting, you should seek medical attention immediately.

If you wait too long to get treatment, the condition may worsen and become more difficult to manage. Nausea and vomiting can be caused by antibiotics that have been administered orally (by mouth). These types of antibiotics are typically given when the patient has an infection in his or her gastrointestinal tract (stomach).

The most serious possible side effect of antibiotics is anaphylaxis.

The most serious possible side effect of antibiotics is anaphylaxis, a life-threatening allergic reaction. This occurs when the body’s immune system overreacts to a substance (a drug, food, or insect sting) that it perceives as harmful.

Bacterial resistance is possible, but not very common.

The most common side effect of antibiotics is diarrhea, which occurs in about one-third of all dogs who take them. Diarrhea can be mild or severe, but it’s almost always temporary and clears up within a few days of stopping the antibiotic.

Other side effects can include vomiting and lack of appetite. If your dog has a serious reaction to his medication, such as anaphylaxis (a sudden allergic reaction), stop giving him any medication until you’re able to consult with your vet.

Blood in the stool is a sign that your dog needs more than antibiotics.

If you notice blood in your dog’s stool, it’s a sign of more serious illness. Blood in the stool is not always due to an infection; it can also be a sign of tumors or colon cancer. If you notice blood in your dog’s stool, call your veterinarian immediately and get him/her checked out as soon as possible.


I hope this article has helped you better understand the risks and side effects associated with giving antibiotics to your dog. If you do notice any of these symptoms after administering them, then it’s important that you call your veterinarian immediately for help.