Heartworm Prevention in Allen, TX, From Your Local Vet
Dogs and cats in Allen need heartworm prevention every month of the year, and most dogs need a quick blood test before starting. Texas now leads the nation in heartworm incidence, according to the American Heartworm Society's survey of 2025 testing. Petfolk Allen is a vet clinic in Allen, Texas, that tests for heartworm, prescribes prevention and helps you keep doses on schedule.
Call (469) 289-2921 or book online.
What is heartworm, and how do pets in Allen get it?
Heartworm is a parasite spread by mosquito bites. Larvae enter the bloodstream and, over about six months, grow into adult worms that live in the heart and lungs and can reach up to 12 inches long. One bite from an infected mosquito is enough, and mosquitoes get indoors, so indoor dogs and cats are at risk too.
The American Heartworm Society recommends year-round prevention for dogs and cats, not a seasonal break. Prevention comes as a monthly chewable or topical, or as a longer-lasting injection for dogs. Many monthly products also cover intestinal worms such as roundworms and hookworms. Read more about our heartworm prevention plan.
Does my dog need a heartworm test before starting prevention at Petfolk Allen?
Yes, in most cases. The American Heartworm Society says dogs over 7 months old that haven't been on a preventive need a test before starting, because giving prevention to an infected dog can cause rare but possibly severe reactions. The test is a small blood sample, and it's repeated once a year.
At Petfolk Allen, heartworm testing comes up at 32% of wellness visits for dogs aged 1 to 5 and 38% for dogs 5 and older (October 2025 to September 2026). Puppies usually start prevention without a test: 64% of Allen puppy wellness visits include a heartworm preventive.
Which heartworm preventives do Allen dogs use?
Most dogs at Petfolk Allen go home on a monthly chewable. Simparica Trio accounts for 84% of dog parasite-prevention purchases at the Allen clinic, and the ProHeart 12 injection for about 6% (October 2025 to September 2026). Cats most often get a monthly topical. The Petfolk Allen doctor picks the product and dose by your pet's weight, age, health history and how easily they take medicine.
How does a heartworm prevention visit at Petfolk Allen work?
A heartworm visit at Petfolk Allen is usually part of a wellness exam.
1. Weight and history. The team weighs your pet and asks about past prevention and any missed doses. 2. Exam. The doctor listens to the heart and lungs and checks your pet nose to tail. 3. Heartworm test. A blood sample for dogs who are due. 4. Plan and estimate. You choose a monthly product or an injection and see the cost before anything is given. 5. Refills. Request refills and set reminders in the Petfolk app.
Petfolk Allen care teams are Fear Free Certified, so nervous dogs and cats are handled gently and at their own pace.
Do cats in Allen need heartworm prevention?
Yes. Cats get heartworm from the same mosquitoes, and both indoor and outdoor cats are at risk. There is no approved drug to treat heartworm infection in cats, so prevention is their main protection (American Heartworm Society). Signs in cats can include coughing, asthma-like attacks, periodic vomiting, poor appetite or weight loss.
What are the signs of heartworm disease in dogs?
Many dogs show no signs for months, which is why yearly testing matters. When signs appear, the American Heartworm Society lists a mild, lasting cough, reluctance to exercise, tiring after moderate activity, and in later stages a swollen belly from fluid buildup. A dog can't test positive until at least 6 months after infection, so a recent exposure may not show up right away.
"I recently adopted a dog that someone abandoned in my neighborhood that unfortunately contracted heart-worms prior to me adopting her." Ryan H., Google review
What if my dog tests positive for heartworm?
If a dog tests positive at Petfolk Allen, the doctor explains the results and the treatment plan, and you see an estimate first. Exercise has to be limited as soon as the diagnosis is confirmed, because activity speeds up damage to the heart and lungs, and exercise during treatment is the leading cause of complications (American Heartworm Society). Prevention alone isn't a substitute for treatment.
What if I missed a dose of heartworm prevention?
Call Petfolk Allen at (469) 289-2921. One missed or late monthly dose can leave a dog unprotected. If two or more months were missed, the American Heartworm Society advises restarting prevention right away and retesting 6 months later.
When does a heartworm question need an emergency vet?
Most heartworm questions can wait for a regular visit. Go to a 24-hour emergency hospital if a dog collapses or has sudden trouble breathing, including during heartworm treatment. Petfolk Allen is open on weekends, weekday hours vary, and it doesn't provide overnight care.
How do I start heartworm prevention in Allen?
Call (469) 289-2921 or book a visit at Petfolk Veterinary & Urgent Care - Allen, or see all veterinary services in Allen.