This is a smart question—and one I’m always glad when pet owners ask.

Any time you give your dog a medication, it is reasonable to ask:

That is not being difficult.

That is being a responsible pet owner.

NexGard is one of the most commonly prescribed flea and tick preventives for dogs. For many dogs, it is a very good option.

But like any medication, it should be chosen thoughtfully.

This article will help you understand how veterinarians think about NexGard, what we know about safety, and how to decide what may be right for your individual dog.

NexGard is an oral prescription medication used to kill fleas and ticks in dogs.

It belongs to a class of drugs called isoxazolines.

This medication class includes several commonly used preventives designed to:

Many owners prefer chewable preventives because they are easier than topical applications for some dogs.

I’ve prescribed flea and tick prevention for many years.

Here is the honest, balanced answer:

For Most Dogs, NexGard Is Well Tolerated

Most dogs who take NexGard do well.

They experience no significant side effects and gain meaningful protection from parasites that can create real health problems.

That matters.

Because flea and tick disease is not theoretical.

It is common, frustrating, and sometimes serious.

This is where internet discussions often become unhelpful.

Some people present medications as completely dangerous.

Others present them as risk-free.

Neither is accurate.

Every medication involves weighing:

That includes NexGard.

Many dogs have no noticeable side effects.

When side effects do occur, they may include:

Mild / More Commonly Reported

Less Common but More Serious Concerns
​
There have been reports of neurologic adverse effects in some dogs, including:

These events appear uncommon, but they are real enough that veterinarians should discuss them thoughtfully.

I use extra caution in dogs with:

In those cases, I may discuss alternatives depending on the dog and situation.

This is why individualized veterinary guidance matters.

What often gets ignored online is the risk of skipping prevention entirely.

Parasites can transmit diseases such as:

Flea infestations can also become household problems quickly.

So the decision is not:

“Medication risk vs zero risk.”

It is usually:

“Medication risk vs parasite exposure risk.”

That’s a more honest framework.

Not every dog has the same risk profile.

Higher Exposure Dogs Often Include:

Lower Exposure Dogs May Include:

But “indoor only” does not mean no flea/tick risk.

Parasites still find ways in.

When helping owners decide, I usually consider:

1. The Individual Dog

2. Lifestyle

3. Owner Preference

4. Overall Risk Tolerance

Some owners value convenience strongly.

Others prefer avoiding oral medications when possible.

Reasonable people can weigh these differently.

Yes. Depending on your veterinarian’s recommendation, options may include:

Each has pros and cons.

There is no universal “best product” for every dog.

Only the best fit for the patient.

I would not rely on:

If your dog seems unwell after any medication:

Do not redose until advised.

For many dogs, NexGard is a safe and effective option.

But thoughtful decision-making matters more than internet opinions.

The best preventive plan is based on:

That is how medicine should work.

I never want owners to feel shamed for asking safety questions.

Ask them.

Good veterinarians welcome informed questions.

That conversation is part of good care.

Join the free PetLovers United newsletter for practical veterinarian-led guidance on prevention, health choices, and confident pet ownership.

Or explore our membership community for deeper education and support.

Because informed decisions protect pets.