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Worming Your Horse
Signs of worms, and how often to worm
Quick Answer
- Most grazing horses carry some level of worm burden — the goal is to keep it low, not eliminate it entirely
- Signs of a high burden are often subtle: poor condition, a dull coat, or mild colic
- A faecal worm egg count (FWEC) helps work out whether worming is actually needed
- Targeted worming, guided by testing, is generally preferred over routine worming on a fixed calendar
Signs of a Worm Burden
- Poor body condition despite adequate feeding
- A dull, rough coat
- Tail rubbing, particularly linked to pinworm
- Mild, recurring colic-type signs
- Diarrhoea or loose droppings
- Lethargy or reduced performance
Common Parasites in Horses
01 Redworm Most common
Small and large redworm are among the most common equine parasites and can be linked to weight loss, diarrhoea, and colic when present in high numbers.
02 Tapeworm
Tapeworm is usually detected via a blood or saliva test rather than a standard faecal egg count, and can be linked to colic and digestive upset.
03 Pinworm
Pinworm tends to cause irritation around the tail base, and tail rubbing is often the main sign owners notice.
04 Bots
Bot fly eggs laid on the coat are ingested during grooming or grazing and develop inside the gut, usually without obvious external signs.
Effective Worming Practice
- Test before treating. A faecal worm egg count shows whether your horse actually needs worming.
- Worm based on results, rather than on a fixed routine — this also helps slow resistance developing in parasite populations.
- Get tapeworm checked separately, usually once or twice a year via a blood or saliva test.
- Manage pasture by removing droppings regularly and avoiding overstocking fields.
- Quarantine and test new arrivals before turning them out with other horses.
- Speak to your vet or a registered SQP about which product suits your horse’s results — they can advise on the right choice and how to use it correctly.
When to Contact Your Vet
- A high egg count result that needs guidance on the right treatment
- Repeated colic episodes alongside any sign of a worm burden
- Unexplained weight loss or poor condition despite worming
- You’re unsure how to interpret a test result
How Pet Med Direct Can Help
Pet Med Direct stocks a range of equine worming treatments and faecal egg count kits to support a testing-led worming routine.
Some treatments require a valid veterinary prescription or SQP recommendation. Pet Med Direct can only supply prescription-only medicines once the prescription has been checked. Always follow your vet or SQP’s advice and the directions on the product label.
Frequently Asked Questions
How often should I do a worm egg count?
Many owners test every 8–12 weeks during the grazing season, but your vet or SQP can advise on a schedule that suits your horse and yard.
Do all horses need worming at the same time?
Not necessarily. Worming based on individual test results, rather than treating a whole yard on the same date, is generally a more targeted approach.
Can worms affect young horses more?
Foals and youngstock can be more vulnerable to certain parasites and may need a different testing and worming approach — speak to your vet about young horses specifically.
Why does pasture management matter for worm control?
Removing droppings regularly and avoiding overgrazing reduces the number of parasite larvae horses pick up while grazing, which supports the effect of any worming treatment.
Need pet products or prescription medicines? Visit the Pet Med Direct shop.
This this article is for informational purposes only and does not constitute veterinary advice.
If you are concerned with your dog’s health, please consult a qualified veterinarian.