Heartworm disease can be prevented in dogs and cats by giving them medication once a month that also controls various internal and external parasites. Heartworm infections are diagnosed in about 250,000 dogs each year. 1 But there is no good reason for dogs to receive preventives all year; it is just not needed.
If you have a dog at home who is already heartworm negative, we highly recommend doing everything you can to keep her that way, which means giving heartworm prevention once a month, every month.
Because heartworms must be eliminated before they reach this adult stage, it is extremely important that heartworm preventives be administered strictly on schedule (monthly for oral and topical products and every 6 months or 12 months for the injectable).
If you miss a dose of your heartworm prevention for your dog, get them back on prevention ASAP—speak to your veterinarian. Six months from that time that you missed is really the only time that we're going to be able to detect whether or not your dog was infected during that period.
Does my dog need heartworm medicine year-round? Yes, your dog needs heartworm medicine year-round. Just because mosquitoes may hibernate in the winter doesn't mean they're gone. And just because you live in a colder state doesn't mean your dog is safe either.
Heartworm disease is a very serious parasitic disease that has the potential to be fatal for your dog if he is not treated quickly. This parasite is a worm that can grow up to a foot long and lives inside the heart, lungs, and associated blood vessels of an infected animal where it will reproduce over and over.
Although there are fewer mosquitoes in the winter, there is still a risk that your pet could get heartworms if you stop giving heartworm prevention medication during this season. That's one reason veterinarians strongly recommend pets receive heartworm prevention medication year-round.
The simplest answer to pet parents who forget a month of heartworm prevention is to simply give the pill or administer the application and restart their monthly preventative schedule.
Your dog will be protected from heartworm disease because you will still be within the 45-day grace period in which the preventative is effective. Resume your normal monthly dosing schedule. 2.) More than 2 weeks: Contact your veterinarian because you are likely outside of the grace period.
However, due to the heartworm life-cycle, it is likely that giving the medication every 45 to 60 days, rather than every 30 days, will allow immature heartworms to develop into adult heartworms. In other words, heartworm prevention medication is not effective when given every 45 to 60 days.
Signs of heartworm disease may include a mild persistent cough, reluctance to exercise, fatigue after moderate activity, decreased appetite, and weight loss. As heartworm disease progresses, pets may develop heart failure and the appearance of a swollen belly due to excess fluid in the abdomen.
Prognosis: heartworm treatment success rates
With the three-dose adulticide protocol described above, in conjunction with doxycycline and macrocyclic lactones as recommended by the American Heartworm Society, 98% of dogs will be cleared of heartworm infection.
The American Heartworm Society recommends that you start heartworm prevention for puppies at 8 weeks of age and keep them on it year-round. Heartworm disease has been diagnosed in all 50 states, and there is growing concern about resistance to some preventatives—mostly due to inconsistent dosing by owners.
The American Heartworm Society has recommended year-round heartworm protection, without missing a dose. A missed heartworm pill leaves your pet exposed to becoming infected, which can happen even in winter. Making monthly heartworm medication part of your pet's health care regimen makes it easier to remember.
Generic Ivermectin
You can prevent heartworm disease by using the same medication sold by drug companies for a fraction of the price. If you have a large dog, you can order the generic ivermectin from Amazon.com. (I have large dogs, so this is the form of ivermectin that I give them to prevent heartworm disease.)
Heartworm treatment is expensive due to several factors: Heartworm medications are relatively new, and their high price is attributed to research and development costs. Moreover, the medication is often imported, making it more expensive to obtain.
Heartworm Prevention? Your pet may have become infected with heartworm larva during the unprotected months. If you missed less than 6 months of prevention we suggest you start giving the heartworm preventative immediately. Bring your dog in for a heartworm test 6 months from the first missed dose.
Many flea and tick medications are manufactured in a once-monthly topical application or pill. If you miss that monthly dose, your pet is at risk of getting flea or tick bites.
However, if you do miss a dose, give it as soon as you remember. Then, adjust the dosing schedule so that the next dose is 30 days after the new dose. Never administer two doses at once or give extra doses.
While on the face of it, splitting the medication might seem like a great and economical idea, this practice is not recommended.
NexGard protects dogs against brown dog ticks, bush ticks and the potentially deadly paralysis tick. NexGard should be given monthly, all year round in areas where paralysis ticks are found.
If owners can't afford treatment at the time of diagnosis, Dr. Herrin recommended delaying melarsomine therapy but still initiating treatment with both a preventive and doxycycline. This will prevent further infection and remove the dog as a heartworm reservoir.
INTERCEPTOR PLUS: Interceptor Plus is a monthly chewable that prevents heartworms and common intestinal parasites, for dogs 8 weeks of age or older. Interceptor Plus is used in conjunction with a flea/tick preventative, such as Nexgard or Bravecto.
A tick is going to get on an older dog just as much as a younger dog. A mosquito can bite them the same, whether they're old or young. So they still need to be on heartworm prevention.
Heartworm tests are recommended on a yearly basis for dogs. They are required in order to refill your heartworm prevention (If you are getting your heartworm prevention from a website that doesn't require a current heartworm test, find somewhere else to get your medication from.