About canine heartworm
Canine heartworm is a disease caused by a nematode parasite known as Dirofilaria immitis. Heartworm commonly affects dogs and wild canids, like coyotes, foxes, and wolves. The microscopic worm-like parasite enters the animal's blood stream through the bite of an infected Western treehole mosquito (Aedes sierrensis). This parasite lives in the animal's heart and lungs, and as the worms become larger, they begin to interfere with the health and function of the heart and lungs, making the animal very sick. It leads to the animal coughing, fainting, coughing up blood, and weight loss. Although heartworm is a health concern for dogs and other canines, it is not usually a threat to other domestic animals or humans.
How can I protect my dog from heartworm?
Keep your dog on a preventative heartworm medication year-round. Talk to your veterinarian to discuss options and develop a plan.
The Western treehole mosquito, who is responsible for transmitting heartworm, breeds in tree holes. You can further protect your dog by reducing the number of tree holes on your property.
How to fill a tree hole
- Determine if the tree hole holds water.
- Tree holes that do not hold water do not need to be filled - they could provide nesting sites for birds and other wildlife.
- If the tree hole holds water, fill in the hole with:
- Expanding foam - make sure the product is made to fill big gaps and is water resistant. Always follow the directions on the product label.
You do not need to clean out the tree hole before filling it in. Expandable foam is flexible enough to move with the tree and will seal the gap to keep it from collecting water.
When filling a tree hole, DO NOT:
- Use gravel or sand - they do not prevent water collection.
- Fill it with concrete - this material is not flexible and can damage the tree.
- Drill drain holes in the tree - this will damage the tree.
How do I know if my dog has heartworm?
Have your dog tested for heartworm on a yearly basis and talk to your veterinarian to start a testing schedule.
