These adult heartworms were removed from the inside of the heart of an infected dog at necropsy. 
Heartworm Diagnosis, Prevention and Treatment
Heartworms are parasites which are transmitted from dog to dog by mosquitoes. As you know, your dog does not have to go outdoors for this bite to occur! Clinical signs of Heartworm disease don't show up right away. But when they do, your dog may be coughing, getting winded very easily, or losing  weight.

A very small immature form of heartworm (called microfilaria) is injected into your pet's blood when an infected mosquito takes a blood meal. Here in Baton Rouge, nearly all mosquitoes are infected with microfilaria. Then, the microfilaria mature into adult heartworms inside your dog's major vessels and heart. Besides creating havoc inside your dog, these adult heartworms go on to reproduce and provide microfilaria for future mosquito bites.
The adult heartworms in your dog or cat cause very serious disease and is often fatal.Heartworm  treatment is very dangerous.

But, the good news is that a blood test can be performed to check our dog for the presence of heartworm. If your dog is negative for the disease, there is safe and effective prevention that will keep your dog from getting heartworm disease. If your dog is unfortunate enough to be positive for heartworm disease, treatment is available but it is expensive and very hard on the body. So, let's try to prevent this deadly disease before it gets started!

Cats can also get heartworm disease! However, the clinical signs are different than in dogs. Cats often show wheezing, coughing, or vomiting. Testing and treatment is also different for cats with heartworm disease. But the good news is that there is prevention available or cats, too!
So, contact us today to fight this deadly parasite.