Vet Blog

07/11/09

Can Any Oral Medication Prevent Ticks, Fleas, and Heartworm
Dr. Eric Barchas, DVM

tick_psf1Do you know of any oral treatments that will cover fleas, heartworm, and ticks? I would really like to get away from the topical application, but we also live in an area with a heavy dear population, so I feel like tick protection is important.

Thank you,

Mandi
Lago Vista, TX

Sadly, I am not aware of any oral medications that effectively prevent ticks in dogs.

Sentinel is a medicine that prevents heartworm, certain intestinal worms, and breeding flea infestations in dogs and cats. It does not kill individual fleas, and it does not prevent ticks.

Comfortis is a new monthly oral flea preventative for dogs only. It does not offer protection against heartworm or ticks. Capstar is a daily (or every other day) oral flea preventative for dogs and cats. It also does not protect against ticks or heartworm.

If you want truly effective tick prevention, at this time you’ll be stuck using a topical treatment such as Frontline Plus, Vectra 3D, or K9 Advantix. Homeopathic oral tick preventatives are not effective in my experience.

One note: you mention that you are worried about ticks because of deer in your area. I presume that means you’re worried about Lyme disease, which is spread by deer ticks. Note that deer populations do not harbor Lyme disease, and the number of deer in your area won’t necessarily correlate with the prevalence of Lyme disease. The reservoir for Lyme disease is a type of wild mouse.

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05/10/09

What Are the Treatments for Tick Paralysis?
Dr. Eric Barchas, DVM

504px-tick_2_akaIs there a cure for advanced tick paralysis?

Jean
Indiana

Among the many creepy things about ticks is a strange syndrome called tick paralysis.

Tick paralysis occurs when nerve poisons (called neurotoxins) in tick saliva enter an infested animal’s bloodstream. The neurotoxins cause progressive muscle weakness. The first sign usually is weakness in the hind legs that may lead to staggering. The symptoms then spread to other portions of the body, ultimately leading to paralysis. In extreme cases the muscles that are used for breathing become paralyzed. This can lead to to death.

Death from tick paralysis is very rare. Also, most animals that are infested with ticks do not suffer from the syndrome. Some individuals appear to be very sensitive to the neurotoxin. Other individuals are quite resistant. Some ticks seem to produce much more of the neurotoxin than others. Therefore, although heavy, long-term tick infestation is most likely to lead to paralysis, some dogs can suffer from the syndrome even with light infestations. Conversely, many (most, in fact) dogs with very severe tick infestations show no symptoms of tick paralysis.

The only cure for tick paralysis is to remove the ticks. Many individuals require supportive (nursing) care during their recovery. Recovery from tick paralysis generally occurs over several hours, but in severe cases it can take several days. Dogs with paralyzed respiratory muscles may require intensive care and treatment with a ventilator until the toxin clears from the bloodstream.

As with all things tick related, the best bet is to prevent infestation in the first place. Several high-quality tick preventatives, such as Frontline, are available for dogs.

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04/27/09

What is the Best Way to Remove a Tick From my Pet?
Dr. Eric Barchas, DVM

tuckA while back I answered a question from a reader who was worried about a suspected tick on her dog. My advice was to take the dog to the vet. I did not discuss tick removal tactics.

This was based upon an uncanny phenomenon that I have noted during my career. Call it Murphy’s law if you will. When a client schedules an appointment for me to remove a tick from his or her pet, the “tick” turns out to be a mole or a skin tag about 90% of the time.

I have seen many pets suffer needlessly as their owners have tried to yank, pry, burn, or twist moles or skin tags off their animals. Therefore, I hesitated to offer advice on tick removal because so often when a person suspects an embedded tick on their pet, they are wrong.

But what if you are absolutely, positively, 100% certain that your pet has an embedded tick? You can see the legs. You can tell the difference between an Ixodes and a Dermacentor. You are absolutely certain that your pet has a tick. What then?

In 1996, before I started vet school, I was on a flight from San Jose, Costa Rica to Los Angeles. I had spent the last week of my first trip to Central America in Corcovado National Park, a spectacular and famously tick infested rainforest in the southwest corner of Costa Rica.

As I mulled over what I might say during my upcoming vet school interview, I suffered an unpleasant revelation. Something was making my rear end itch. In the airplane’s bathroom my worst fears were realized: I had a tick embedded in my rear.

In the privacy of my Oakland apartment later that day, I discovered that the situation was more serious than I had expected. There was not one tick but twelve, embedded all over my body.

I tried lighting matches, putting them out, and using the still hot match tip to cause the ticks to withdraw. The ticks were not fazed, but I did burn myself in several places.

For my next attempt, I applied a common cold sore remedy to the ticks. No effect. Next I smothered the ticks with petroleum jelly. If the ticks noticed that I was tryikng to get rid of them, they didn’t let on. They passively rode out my efforts without batting an eye (metaphorically speaking, since ticks don’t have eyelids).

Finally, I turned to tick twisting. Using tweezers, I twisted the ticks off of my body. Success! I removed 12 tick thoraxes and 12 tick abdomens. Unfortunately, 12 tick heads were left embedded in my skin.

About eight months later, as my body was finally completing the process of digesting and eliminating the heads that were left in my body through my inept attempts at tick removal I took my first course in veterinary parasitology.

One day in class Dr. Patricia Conrad, parasitologist and expert in the field, described the best way to remove a tick. I wish I had known it sooner. I find that it removes entire ticks about 90% of the time.

Here, according to Dr. Conrad, is the best way to remove a tick from your pet:

Grasp the tick firmly wth hemostats (aka tweezers) as close to the skin as possible. Pull gently but firmly straight away from the skin until the tick comes out. Do not twist. Avoid grasping the tick’s abdomen. This can cause regurgitation of stomach contents into your pet, increasing the likelihood of Lyme disease, Ehrlichiosis, Rocky Mountain Spotted Fever, and other scary tick-borne diseases.

Some other points: tick prevention is better than tick removal. In my experience, Frontline is the tick preventative with the best safety and efficacy profile. No tick preventative is 100% effective.

Finally, think at least six times (twice is nowhere near enough) before removing a tick from your cat. Healthy cats almost never suffer from tick infestation due to their good grooming habits.

Photo: no evidence of ticks on Tuck.

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04/20/09

What Should I do About a Tick on my Dog?
Dr. Eric Barchas, DVM

504px-tick_2_akaHello,

I think I found a tick between Stuart’s toes. It could be that just the head is left, because I don’t see any legs. Should I try to remove it?

Heather
San Diego, CA

If you are not completely certain that what you are seeing is a tick, then I would not recommend that you attempt to remove it.

Ticks are blood sucking parasites that can carry a number of diseases. Lyme disease is the most famous, and dogs are susceptible to it. Ticks also spread frightening diseases and syndromes with scary names such as ehrlichiosis, tularemia, Q-fever, tick paralysis, and rocky mountain spotted fever.

Fortunately, most dogs that suffer from tick infestation do not contract a serious disease. Skin infection at the site of attachment is the most common complication that I see.

A vet should definitely take a look at Stuart’s foot. If, in fact, a tick is attached then it should be removed. But you should be aware that skin tags, benign tumors, moles and warts sometimes look like ticks. Your best bet is to have a professional assess the situation.

Photo: André Karwath. Photo license: CC

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08/21/08

How Common is Lyme Disease in Dogs?
Dr. Eric Barchas, DVM

ldincidencebycntymap_06.gif
Map credit: Centers for Disease Control. The geographic distribution of Lyme disease in dogs closely matches the distribution in people.

Our 10-year-old Terrier Jazz has been bitten by two
ticks this summer . How would I know if she has
gotten Lyme disease from them? How would I tell? We
keep her on heart worm and fleameds all the time.

Angel
Knoxville Tn.

Lyme disease (often misspelled lymes disease) is spread by ticks. It can infect humans and dogs. Lyme, Connecticut has the dubious distinction of being the place where the disease was first identified. The disease is named after the town.

A fair bit of misinformation circulates about Lyme disease. The bacteria that causes the disease is most commonly spread by a type of tick called the deer tick. Many people therefore believe that deer serve as reservoirs for the disease. That is not true. In fact, certain species of wild mice are the reservoirs.

Many people also believe that Lyme disease is common throughout the United States. That also is not true. As the map above shows, Lyme disease is very common along the northeastern seaboard and in the upper midwest. It is rare elsewhere.

In particular, Lyme disease is not common in the west or the south. Experts believe Lyme disease is rare in these areas because ticks prefer to feed on lizards, rather than mice, before they feed on people or dogs.

So, to answer your question, it is not likely that Angel has contracted Lyme disease.

However, that does not mean you don’t have to worry about ticks.

First, researchers have noted that tick populations are spreading and migrating throughout the United States, and their feeding habits may change. Therefore, the distribution of Lyme disease may change over time.

Also, although Lyme disease gets the most press, remember that ticks spread all sorts of other nasty diseases to humans, cats and dogs. These include rocky mountain spotted fever, ehrlichiosis/anaplasmosis, tularemia, Q fever and cytauxzoonosis.

The symptoms of most tick-borne diseases are vague. Affected animals may suffer lethargy, limping, swollen joints, decreased appetite or weight loss. In the later stages of the diseases, multiple types of organ failure may occur.

Veterinarians can run blood tests to check for exposure to the most common tick-borne diseases. I recommend that these tests be run on any pet who has been parasitized by ticks. Most tick-borne diseases can be treated if they are caught early.

The most effective way to prevent tick-borne diseases is to prevent ticks from biting your pet. Several combination flea and tick preventatives are available through veterinarians for at-risk animals.

For more information on the geographic distribution of Lyme disease in people, click here.

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