2025 Pet Parasite Forecast: Rising Tick and Heartworm Threats
The Companion Animal Parasite Council (CAPC) has released its 2025 Pet Parasite Forecast, and the outlook shows a continued rise in vector-borne diseases that threaten our dogs. From Lyme disease to heartworm, expanding tick and mosquito ranges mean prevention is more important than ever. If you're thinking long-term about your pet's health, you might also like April Pad's guide to how long dogs live—and how preventive care adds precious years.
What Is the Pet Parasite Forecast?
Each year, CAPC analyzes more than 10 million diagnostic test results to map where parasites are most likely to infect pets. Their annual forecast pinpoints the regions with the highest risk and highlights where new outbreaks are emerging.
Key Threats for 2025
- Lyme Disease & Anaplasmosis: Tick-borne risks continue to push south and west, putting dogs in areas once considered safe at new risk.
- Ehrlichiosis: Historically concentrated in the Southeast, this tick-borne infection is creeping north into the Midwest and New England.
- Heartworm: Warmer temperatures and shifting mosquito populations mean heartworm is spreading along the Mississippi River valley and into parts of the West that rarely saw cases before.
Hotspots to Watch
CAPC’s updated maps show rising infection pressure in:
- The Upper Midwest and Northeastern states for Lyme and anaplasmosis
- Southern Atlantic and Gulf Coast regions for heartworm
- Parts of Colorado, Wyoming, and Northern California for emerging heartworm activity
Protecting Your Dog
Year-round parasite prevention is the best defense. Talk to your veterinarian about:
- Monthly broad-spectrum preventives that cover both heartworm and intestinal parasites
- Regular tick checks after outdoor adventures
- Vaccination against Lyme disease where recommended
- Keeping yards trimmed and avoiding tall grass during peak tick season
Bottom Line
The 2025 forecast makes one thing clear: parasites don’t respect state lines. No matter where you live, a proactive prevention plan keeps your dog healthier, safer, and ready for every adventure.
