Side Effects of Deworming a Puppy

Written By Alla Levin
July 18, 2022

Side Effects of Deworming a Puppy

Deworming puppies means ensuring your puppy remains safe against hookworm, tapeworm, roundworm, and whipworm. Treating your puppy with a broad spectrum of deworming will ensure the prevention of passage of it to a family member.

Puppies are usually born with the parasites passed on from their mother. And to get them out, deworming is done. To deworm your puppies, go to the vet. He/she will give your puppy medicine by mouth or inject worm-kill medicine through the skin.

These medicines are categorized as broad-spectrum because they are efficient in killing a wide range of parasites, including the worm that lives in the gut. These medicines are poisonous to pests but safe for pets.

Why is Deworming necessary?

Deworming puppies is essential to increase their nutritional uptake and manage anemia and lose bowels. It hence protects their immunity and prevents them from getting infected with diseases caused by worms.

Neglecting the process of deworming can cause growth retardation and even death of your puppies, so it is recommended to deworm them every 2-3 weeks until they reach the age of 3 months. The early age deworm is necessary to maintain your puppy’s healthy growth and prevent rushing them to the hospitals.

What to expect after deworming?side effects of deworming a puppy

While the process of deworming does not over with the intake of medicines, it has some after-effects that you should be aware of. After the medication is given or injected, you will not notice any amiss if it’s shown at normal doses.

Still, you might observe signs of an allergic reaction such as facial swelling, itchiness, hives, or shock. This happens because, after the process of deworming, all the parasites in the intestine die and cause a high rate of inflammation in the lining of the intestine.

This is likely to make your puppy fall ill; however, deworming medicines are likely to cause some more side effects. Listed below are some of the serious after-effects of deworming that your puppy will likely suffer from.


The most common type of worm that affects puppies is intestinal worms, which are more located toward the intestine lining. They stick to the lining of the intestine and suck the nutrients as it passes through. Once the medication is given and the worm dies, they fill up the intestine causing the body to flush them with excess liquid. So, one of the expected effects of deworming a puppy is diarrhea.

Their body passes a lot of feces to get rid of the dead worms. It is likely to come out from their body with poop or spaghetti, so be prepared for it, or else if you find it difficult to deal with it then seek the doctor immediately.


Due to some drugs in the deworming medicine, your puppy likes to vomit immediately after being given the pill, as she may still feel nausea and may get retch to get rid of the tablet. This happens as the medicine starts to release toxins from the body and make the worms die, and this causes the body to act and expel them in the form of vomiting.

Therefore, keep a check after giving the medicine, as vomiting is common after medication, but you have to pay attention to whether with the act of vomiting, the pill has come out or not. If it hasn’t come out, then there is nothing to worry about, but if it is, then you need to seek the doctor immediately because resting the pill in the intestine is essential to cure the problem entirely, If it has come out, ask your doctor to follow the medication again.

Excessive salivation

Whether your puppy is a slobber monster or not, the deworming pills can cause excess salivation; this has the same reason as vomiting. When your puppy’s stomach is upset, he will drool as his stomach flips. Much like humans do when the saliva glands react to the feeling of nausea.

If your puppy already slobbers, you might observe excessive it after the medication; this indicates fluid loss, causing dehydration, and must counteract with the significant water intake. Hence, ensure your puppy has excess drinking water; drooling may eventually subside after a few hours of medication.

Lack of appetiteVomiting

Again due to an upset stomach caused by deworming pills, your puppy will likely lose proper appetite. Even if he isn’t sick or suffering from diarrhea, he can still have a sore stomach. It happens naturally because the lining of intestine gets disturbed and causes inflaming.

This causes the feeling of sickness, which usually causes a lack of appetite in puppies. Poor appetite or days might seriously hinder growth and affect the puppy’s health. Therefore, keep a check on it and do not disregard it for days, even after many days of medication; if your puppy is still reluctant to eat, then take him to the vet for nutritional values and vitamin intake.


Deworming a puppy is an essential and crucial process; however, medication doesn’t reflect the effects immediately, but you need to be prepared for future hours; you can find side effects and complications in Deworming more located here. Your puppy I likely to go through these problems and even face growth retardation or sometimes death; taking care of your pup is necessary, and that too way more cautiously.

If you might feel tough to deal with the after-effects of medication, then seeking the doctor is the best option you can choose; the doctor is an expert to guide you with proper caregiving techniques and suggest dos and don’ts till the time your puppy gets fully recovered.

The warning is not to delay the process of deworming as it has several serious causes later, and you are not willing to see your pet suffer that much. Maybe it feels tough until the process is fully completed, but it is necessary to protect your puppy and provide them with healthy growth and good life ahead.

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