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  North Hoffman Veterinary Clinic

NEws/BLog

Heartworm- Prevent it so you don't have to treat it!

A common question I get is whether or not it is really necessary to give dogs heartworm preventative.  Usually the owner is concerned about overmedicating their dog.   This simple answer is: Yes.  It really is necessary to prevent heartworm.

How likely is your dog to get heartworm if they aren't on preventative?  In Cook County they track the prevalence of heartworm in coyotes, and the prevalence is about 41%.  Coyotes of course are not on heartworm preventative.  So if your dog isn't on heartworm preventative, you might imagine that there is about a 41% chance they could contract it.  Of course most dogs don't spend 24 hours a day outside like coyotes do.  But mosquitoes find their way into houses too.  I have diagnosed dogs who allegedly are seldom and only briefly outside with heartworm disease.

Let me describe what happens if you don't use the preventative.  Heartworm is transmitted via mosquito bites.  From the transmittable larval stage it takes about 6 months to develop to the adult stage.  It is the adult stage that we are able to test for.  So if your dog tests positive for heartworm, it already has adult heartworms living in its pulmonary artery.  Hearworms are in the nematode family, the same family as earthworms, and they are large enough to see with the naked eye.
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They are also large enough to damage the heart and cause heart failure.

At that point, we have to kill the adult heartworms, and using heartworm preventative will not isn't enough.  First we treat the
dog with a month antibiotics to weaken the heartworms.   Then we can give the medication that will kill the heartworms.  This medication contains arsenic and must be injected deep into the muscles that run along the spine.  As you can imagine, these injections are painful.  A series of 2 or 3 injections is required.

Once that is complete, the heartworms should die, but they don't just disappear.  Now your dog has dead heartworms in their heart, which isn't much better than live ones.  As the dog's immune system slowly breaks these dead worms down and  removes them, there is a risk that these small bits will cause a blood clot in the lungs which can be fatal.  In order to prevent that from occurring, we recommend continued cage rest with minimal activity until the dog is rested as negative for heartworms, usually 4-6 months after the treatment has been concluded.  So cage rest for about a 5-9 month period altogether.

The moral of the story here is: it's much better to prevent heartworm disease with a monthly medication of some kind, than it is to have to get rid of these worms after the fact.
Raw Food Diets

Raw food diets have become more and more popular over the last several years.  Pet owners are either feeding their pets diets entirely consisting of raw foods, or often supplementing more conventional diets with raw animal products as treats.

The question is:  Are these raw diets beneficial for your pet?

There is, as of right now, no scientific study that shows that feeding raw diets will benefit your pet in any way compared to regular pet foods.  There is no study that shows that raw diets will lead to improved health or longer life for your pets.

There are a number of studies and case studies, however, that have shown that there are some health risks associated with feeding raw diets.  Using a raw diet exclusively or even feeding raw diets as treats, can potentially cause an imbalance in the diet (for example, too much fat).  More importantly, raw foods have an increased risk of being contaminated with harmful organisms such as Salmonella.  These harmful bacteria can cause vomiting, diarrhea, or even death in your pets.  And they also pose a risk to the human members of the family who have handled the raw foods, or who have handled the pets after they became ill, or in some cases, just carriers of Salmonella or one of the other pathogens associated with raw foods.

For more information, check out this link to the Tufts University vet school's nutrition department:
​ ​http://vetnutrition.tufts.edu/2016/01/raw-diets-a-healthy-choice-or-a-raw-deal/



Mosquitos and fleas and ticks, oh my!

3/1/2016

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If you have a pet, especially if you have a dog, there are three insect "vectors" you need to worry about: fleas, ticks and mosquitos.  If you have a cat that spends time outdoors, these vectors are of concern for them too.

Fleas cause itchiness, dermatitis and can be a source of tapeworms!  They are very easily spread from pet to pet and lay lots of eggs.  So a single treatment is not going to be enough to rid your pet of fleas once they have them.

Ticks are a source of Lyme disease,  which most people have heard of, and for which there is a vaccine for dogs.  However, they are also a source of some other tick borne diseases like Anaplasmosis and Canine Ehrlichiosis for which we do not have vaccines, and these diseases can be an even greater threat to your dog's health than Lyme is.

Luckily for dogs and cats, mosquito bites rarely cause the itchy welts for them that they do in humans.  Dogs and cats are not as allergic to mosquito saliva as we are.  However, unluckily for dogs and cats, they can contract heartworm disease from mosquito bites.  

In the case of fleas and ticks, we try to prevent the diseases they carry by killing and/or repelling the fleas and ticks.  In the case of mosquitos, while there are some flea/tick products which also repel mosquitos, we do not rely on them to prevent trasmitting heartworm.  Instead we give a medication that would kill any heartworm larvae that may have been transmitted by a mosquito bite.

Another difference between that approach to fleas/ticks and the approach to mosquitos/heartworm is that the flea/tick medication, once it has been given, is typically going to last for a month (or up to three months depending on the product).  Heartworm treatment typically only lasts a few hours.  What it does is it kills any larvae in the pet that were obtained within the last month by a mosquito bite.  So we give heartworm preventative monthly, not because it will last for a month, but because it can kill any heartworm that the pet was exposed to in the previous month.  Once those heartworm larvae have been living in your pet for more than a month, they get harder to kill with preventative.

So when do you begin flea/tick/heartworm preventative, and when can you stop it?  The answer depends on the weather and the temperature.  If it's an early spring or an unusually warm fall/winter, it is easy to start too late or end too early giving the preventative medications that you need to keep your pet healthy.  For that reason, we recommend giving these medications all year round.


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    Dr. Jon Jacobson DVM

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  • Home
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