Posted by Pet Honesty on

Dog Parasites: Prevention and Treatment

Table of Contents


Dogs, our loyal and faithful companions, are unfortunately susceptible to a variety of parasites. These unwelcome guests, ranging from fleas and ticks to heartworms and intestinal worms, can affect dogs significantly and cause serious health problems.

This guide aims to shed light on what a dog parasite is, its potential dangers, and, importantly, how to prevent and treat parasites in dogs. With the right measures, we can ensure the well-being of our pets and keep their tails wagging joyfully.

Why is it important to prevent parasites in my dog?

Parasites can not only cause discomfort and pain to infected dogs but also bring about serious health implications. If left untreated, these parasites can cause anemia, intestinal blockage, lack of appetite, or even death in extreme cases.

Furthermore, some parasites are zoonotic diseases – that is to say, they can be transmitted from infected dogs to people. Therefore, it is essential to be diligent in taking preventive measures and promptly treating any infestations that may occur in an infected dog.

two dogs on grass

Common Parasites in Dogs


Ticks are small arachnids that feed on the blood of their hosts. They can transmit dangerous tick-borne diseases like Lyme disease and Rocky Mountain spotted fever. Dogs can often contract parasites such as ticks from being outside in grassy areas with lots of long grass.


Fleas are tiny parasitic insects that feed on the blood of their hosts, adult dogs. Dogs may suffer from various skin reactions due to flea bites, including severe itching, hair loss, and skin infections. An infected flea can also create serious health problems, as infected fleas carry other parasites, such as tapeworms.

Intestinal worms

Intestinal worms are parasites that live in the intestines and can cause diarrhea, vomiting, or weight loss. The most common types of intestinal parasites are roundworms, hookworms, whipworms and tapeworms:


Roundworms, which are also known as Ascaris, are the most common type of parasitic worms found in dogs. They can grow to be quite large and may cause vomiting and diarrhea.


Hookworms live in the intestines and feed on blood. Symptoms may include severe anemia and, weight loss, bloody feces, and vomiting.


Whipworms are small, threadlike parasites that can cause intestinal issues such as diarrhea and weight loss in dogs.


Heartworms are malicious parasites that can live in the heart, lungs and associated blood vessels of dogs (and cats). These worms are originally transmitted by coming in contact with an infected mosquito.

Heartworm disease, in severe cases, can cause lasting damage to the cardiovascular system if left untreated. Symptoms of heartworm infection include coughing, weight loss, and decreased appetite.

pup laying down

Identifying Parasite Infestation

Common symptoms suggesting a possible parasite infestation include:

Gastrointestinal upset

If your dog is experiencing frequent bouts of diarrhea, and vomiting, or seems to have an unusually upset stomach, it could be a sign of an internal parasitic infestation. Internal parasites often reside in the intestines and can disrupt the digestive system.

Some dogs may also display changes in their stool, such as consistency or color. These symptoms require immediate attention and consultation from a veterinarian.

Weight loss

Parasitic infestations can cause weight loss in dogs due to the parasites’ ability to absorb nutrients meant for the dog. If your dog has been losing weight without any other changes (i.e., diet, exercise), then it’s important to have them tested for parasites.

Skin issues

Rashes, itching, hair loss, and other skin irritations can be signs of an infection caused by external parasites. External parasites such as fleas and ticks are the most common dog parasites known to cause skin irritation in dogs. Ear mites can also cause skin issues, such as itchy, red, and waxy ears; however, ear mites usually only affect young puppies.

If your dog is suffering from skin issues due to a parasite infection, then supplementing its diet with vitamins can help maintain healthy skin while receiving treatment.

Coughing or difficulty breathing

If your dog is frequently coughing or having difficulty breathing, then it may be a sign of early stages of heartworm infestation. Adult heartworms can cause serious damage to the lungs and heart if left untreated, which is why it's important to take your dog immediately to the vet if you notice any respiratory symptoms.

Lack of appetite

Loss of appetite can be a sign of several health issues, including parasites. If your dog has an otherwise healthy diet and suddenly refuses to eat, you might want to have them tested for parasites.

flea and tick support for dogs


Anemia can be a sign of hookworm infestation as these parasites feed on the blood of their hosts. Anemia is characterized by pale gums, lack of energy and poor coat condition.

Skin lesions

Skin lesions can be caused by a variety of parasites, including fleas and ticks. These lesions may appear as red bumps or scabs on the dog's body.

Vomiting of worms

Vomiting out worms is a sign of roundworm infestation. This type of parasite can grow to be quite large and can cause discomfort if left untreated.

Behavior changes such as lethargy or aggression

Parasites can cause a variety of behavior changes in dogs, such as lethargy and aggression. If you’ve noticed any unusual changes in your dog’s behavior, it may be a sign of a parasitic infestation.

Prevention of Parasites in Dogs

Regular flea and tick treatments

Flea and tick treatments should be part of your regular grooming routine. Speak to your veterinarian about the best product for your dog and make sure to use it as per the instructions.

Keeping your dog’s environment clean

Keeping your yard and home clean can help reduce the risk of parasites. Mow the grass regularly, pick up any debris, and keep your pet away from areas where wild animals congregate.

Regular vet visits

Regular checkups with a veterinarian are essential for preventing parasites in dogs. During these visits, the vet will be able to identify any clinical signs of parasites and recommend treatment.

Avoiding contact with sick animals

Parasites can be spread from one animal to another, so avoid contact with stray or unknown animals. If you do come into contact with them, make sure to thoroughly wash your hands and keep your dog away from them.

Proper sanitation

Practice proper sanitation when dealing with any pet waste or contaminated materials. Make sure to wear gloves, wash your hands thoroughly, and dispose of any material in a sealed bag.

white dog

Heartworm prevention strategies

Heartworms are spread by mosquitoes, so make sure to use a heartworm preventative medication as directed by your veterinarian. Also, keep your dog away from areas where standing water accumulates (e.g., puddles, ponds) and regularly check for any signs of mosquito activity in your area.

Feeding high-quality food

Feeding your dog a high-quality diet can help support its immune system and reduce the risk of parasites. Choose foods that are rich in protein, wholesome grains, vitamins, and minerals.

Regular grooming and baths

Regular brushing and baths will help remove any parasites that may be on your dog’s skin or coat. The best shampoo to use if your dog has a parasitic infection is a high-quality Chlorhexidine shampoo, as these shampoos will help relieve itchiness and skin infections.

Helpful Options for Parasite Infestations

Understanding vet-prescribed treatments

It's important to understand the treatments prescribed by your vet. They may include deworming medications, flea or tick preventatives, and other parasite prevention strategies. Make sure to follow their instructions carefully and never skip any doses.

Over-the-counter treatments: effectiveness and safety

Over-the-counter treatments can be effective, but always read the instructions carefully and use them as directed. Speak to your veterinarian about any questions you have regarding over-the-counter treatments before using them.

Natural treatments

There are also natural options to help manage parasites, such as garlic or apple cider vinegar. Speak to your veterinarian about these treatments before using them, and make sure to follow the instructions carefully.

Recovery process and follow-up care

Once your dog has been treated for parasites, follow up with regular vet visits and maintain a routine of parasite prevention strategies. Make sure to continue using flea and tick treatments as prescribed, practice proper sanitation around pet waste, and keep your home and yard clean. This will help reduce the risk of future infestations.


A final message to owners...

Remember that prevention and early detection are key when it comes to parasites in dogs. Regular vet visits, a healthy diet, and flea and tick treatments can help reduce the risk of infestations. If any signs of parasites infect dogs are detected, make sure to seek treatment right away.

Responsible pet ownership is key for keeping your dog healthy and parasite-free. Make sure to follow the instructions of your veterinarian, practice proper sanitation, keep your home and yard clean, and avoid contact with stray animals. Taking these steps can help ensure that your dog remains a happy and healthy companion for years to come.

For more information about parasites in dogs, please speak to your veterinarian. They will be able to provide additional advice and resources for preventing and treating infections. Additionally, there are many online resources available with helpful information about common dog parasites too.

By taking these steps, you can help keep your pup healthy and free of parasites!

Happy pet parenting!