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Preventing and Treating Mosquito Bites in Dogs

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Preventing and Treating Mosquito Bites in Dogs

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The only thing I dislike about warm months is that the mosquitoes come back in full force. If you live in an area where you don’t have them, consider yourself lucky. In my area, they are out day and night.

Mosquitoes are not only annoying to our dogs and us, but they also carry disease. For dogs, the main disease caused by mosquitoes to worry about is heartworm. Left untreated, heartworm can be fatal, and it’s an expensive disease to treat. It’s better to prevent it.

To prevent heartworm, have your Chihuahua checked for the disease (it’s a simple blood test). If he doesn’t have it, you can put him on heartworm preventative medicine. You can get it from your vet, your local pet store, or Amazon.B 

Another issue caused by mosquito bites is that your dog can scratch it until it bleeds or develops an infection. Let’s look at the dangers of mosquito bites and why preventing and treating mosquito bites in dogs is so important.


This is a parasitic condition that is very serious for a dog. The disease is spread by mosquitoes. When an infected dog is bitten, the blood the mosquito gets may contain heartworm offspring. So, when that same infected mosquito goes and bites another dog, that heartworm offspring passes through.

Once inside of a host, heartworm parasites can grow to be up to a foot long and can cause serious damage to the lungs, the arteries, and the heart. Other symptoms of heartworm infection in dogs include lethargy, coughing, vomiting, difficulty breathing, fainting, and exercise intolerance. Yes. All of this can happen from a single insect bite.

West Nile Virus is another disease that mosquitoes pick up and transmit to your dog. The mosquitoes get West Nile Virus from infected birds. However, an infected dog rarely develops this disease.


Testing is one of the most important aspects of heartworm treatment in dogs. The vet will do the blood test to rule out heartworm disease before starting any kind of preventative treatment for a mosquito bite. As always, any treatment you put your dog through should be under the direction and control of your veterinarian.


  • Wipe it with a little rubbing alcohol. It seems to stop the itch
  • I have also dabbed it with coconut oil, which healed it quickly and took away the itch
  • Haven’t tried this but have heard that Preparation H helps relieve the itch
  • Witch Hazel works well too to take away the itch
  • If you are growing Basil in your garden, pick off a leaf and rub the bite with it

It is also a good idea to keep an eye out for any kind of allergic reaction the dog may experience as the result of a mosquito bite. You may notice that your dog starts suddenly licking or scratching.

There may also be some swelling, redness, and hives, which all indicate an allergic reaction. One single mosquito bite is all it takes to cause this level of itchiness and irritation, which can cause your pup to lick, bite, and chew at their skin.


  • Avoid walking your dog at night or early morning and early evening if possible, as this is the time mosquitoes are most active
  • Avoid walking your dog in marshy areas
  • Plant mint near your doors (it’s a natural insect repellent)
  • Change water in your dog’s water bowl every day
  • Make sure there is no stagnant water in your yard
  • Keep a citronella plant or candle near your back door
  • Plant a Eucalyptus tree. They don’t grow very large, and not only do they repel mosquitoes, but they also repel fleas too
  • Make sure the screens in your windows don’t have any holes or tears in them


Now that you know more about what you can do to treat and prevent mosquito bites, let’s take a look at a few things you should keep in mind to avoid.

Avoid using any products or insect repellent on your dog that contains DEET or picaridin. OFF is a brand that contains DEET. We should also avoid using it ourselves because our dogs love to lick us and be close to us. DEET should never be used as a mosquito repellent for dogs, and you should avoid using it on your skin if you choose to use it at all.

You should also avoid using products that aren’t specifically designed for use on dogs. For example, if you find a product that says for cats only, don’t use it on your dog. Always read the labels very carefully and discuss products you intend to use with your veterinarian.

Avoid using undiluted essential oils on your dog as well. Dogs are very sensitive to the liver-toxic effects that some essential oils can cause.


Ultimately, it is up to the dog owner to protect the dog. We can do this by offering our dog year-round heartworm prevention. This includes regular testing and preventative treatment under the care of an experienced veterinarian.

While heartworm can’t be transmitted directly from one dog to another, it can be transmitted through the bite from an infected mosquito, which is why heartworm prevention and treatment are so important to a dog’s health.

Since mosquitoes thrive in warm and humid environments, make sure to avoid areas where they are out and most active. Mosquitoes are very active during the early morning and late afternoon and evening hours. So, it is best to avoid walking our dog during these times.

Do you have issues with mosquitoes in your area? Any great remedies you’d like to share? I’m all ears ?