Sentinel for Dogs: How It Works

Sentinel for Dogs

Sentinel for Dogs: Sentinel for dogs is a broad-spectrum dewormer that protects your dog against heartworms, hookworms, roundworms, and whipworms. It comes as a chewable flavored tablet that most dogs gobble up like a treat.

So with regular monthly use of Sentinel as directed, you can rest assured your pup is protected from these internal parasites that threaten their health and happiness. The tablets are very safe and effective, with minimal risk of side effects in most dogs. However, some may experience digestive upset, so give the first dose on a full stomach.

Sentinel requires a prescription from your vet, who will first test your dog for any existing heartworm infection before starting the prevention protocol. An annual heartworm test is also recommended, even for dogs on year-round Sentinel, to ensure no heartworms were transmitted before starting the medication or in between doses.

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The Benefits of Using Sentinel for Your Dog

Sentinel for Dogs

Using Sentinel for your dog provides some key benefits.

1. Protection Against Pests

Sentinel protects against more than just fleas – it also prevents heartworm disease, whipworms, hookworms, and roundworms. These internal parasites can cause serious health issues if left untreated, so Sentinel is a broad-spectrum solution.

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2. Convenient and Easy to Use

Sentinel comes in a tasty chewable tablet that most dogs love. Simply give one tablet each month with or without food for continuous protection. No messy topicals or injections required.

3. Peace of Mind

Knowing your dog is protected from common parasites and the diseases they transmit can give you peace of mind. You’ll never have to worry about remembering to apply or reapply a topical medication since Sentinel works continuously for a full month with each dose.

4. Safe and Effective

Sentinel is safe for use in puppies as young as 4 weeks of age and can be used in breeding dogs. It has been rigorously tested and used for over 20 years with an excellent safety record. The active ingredients – lufenuron, milbemycin oxime and praziquantel – are proven to eliminate parasites while having minimal side effects when used as directed.

Using a broad-spectrum heartworm and intestinal worm preventative like Sentinel is one of the best things you can do for your dog’s health and well-being. Ask your vet about getting your dog started on Sentinel today so you can benefit from worry-free parasite protection and keep your furry friend happy and thriving.

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How Sentinel Works to Protect Your Dog

Sentinel protects your dog in two ways:

1. Repelling and killing fleas, ticks, and mosquitoes

Sentinel contains insect growth regulators called lufenuron and milbemycin oxime, which disrupt the growth of flea, tick and mosquito larvae. This helps break the life cycle of these parasites to prevent infestations. Sentinel also contains spinosad, which kills adult fleas and ticks currently on your dog. These ingredients work together to repel and kill parasites before they can bite and infect your dog.

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2. Heartworm prevention

Perhaps most importantly, Sentinel prevents deadly heartworm disease. The main ingredient, milbemycin oxime, kills the larvae of heartworms before they can develop into adults that infect the heart and arteries. Heartworm disease is spread through the bite of infected mosquitoes, so using Sentinel monthly, year-round is the best way to safeguard your dog’s heart and health.

To get the full benefits of Sentinel, here are the key things to keep in mind:

  • Use Sentinel monthly, year-round. While fleas, ticks and mosquitoes are more prevalent in the warmer months, heartworm disease prevention must be continuous.
  • Make sure your dog is always on Sentinel before heartworm season starts. If not, you’ll need to do a heartworm test and get approval from your vet before starting Sentinel.
  • Dose your dog within a day of the same date each month. For the best protection, be as consistent as possible.
  • Use Sentinel for dogs only. Do not give this medication to cats, as it can be toxic for them.
  • Store Sentinel as directed and keep out of reach of children and other animals.
  • Report any suspected side effects to your vet immediately. Serious side effects are rare, but can occur.


How quickly does Sentinel start working?

Sentinel starts working within 24 hours after the initial dose is given. It contains lufenuron, which prevents flea eggs from hatching. Any fleas currently on your dog will die within a month. Sentinel also contains milbemycin oxime to prevent heartworm disease, which will be effective within a month of starting the medication.

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How often do I give Sentinel?

Sentinel is a once-a-month, chewable tablet. It’s easiest to give it year-round, as directed by your vet, to ensure continuous protection. Consistency is key. If you stop giving Sentinel for any reason, its effects will wear off in about a month.

Are there any side effects?

Sentinel is generally very well tolerated, but some dogs may experience mild side effects like lethargy, loss of appetite, or diarrhea. Serious side effects are rare but can include seizures or allergic reactions. Be sure to watch your dog for any unusual symptoms after starting Sentinel. If your dog shows signs of a bad reaction, contact your vet immediately.

What if my dog eats more than the prescribed amount?

Accidental overdose of Sentinel can be dangerous. If your dog eats too many tablets, contact your vet or an animal poison control center right away. They may advise inducing vomiting or giving activated charcoal to help absorb any medication left in the stomach. Hospitalization and further treatment may be needed depending on the amount ingested.