The short answer? Yes, but perhaps not in the way you might expect.
Worms are a year-round concern for dogs, and we'd never want to suggest you can relax your guard in winter. But as the temperatures rise and your dog spends more time outdoors, the conditions that allow worms to thrive and spread become noticeably more favourable. Here's why spring and summer deserve extra attention when it comes to your dog's intestinal health.
Warm weather helps worm eggs develop faster
Worm eggs and larvae don't just sit passively in the environment waiting to cause trouble. They have to develop to an infectious stage before they can infect your dog, and that development is heavily influenced by temperature and moisture.
Warm spring and summer temperatures are ideal conditions for roundworm eggs to become actively infectious. The same applies to hookworms, which thrive in warm, moist soil and peak in infection rates during summer and autumn. Whipworm eggs can survive for years in the right conditions, and warm, damp soil is exactly what they need to remain viable.
This means that parks, fields, and garden soil become increasingly loaded with infectious larvae as the warmer months progress, right when your dog is spending the most time sniffing, rolling, and doing what dogs do.
Your dog is simply doing more risky things
It's not just the environment that changes, your dog's behaviour does too. More walks, more off-lead time, more contact with other dogs and their mess, more paddling in streams and puddles, more grass-licking and investigating dead things in hedgerows. You know exactly which dogs we're talking about.
Each of those activities is a potential route for worm transmission. And the more exposure to contaminated soil, standing water, or infected faeces, the higher the risk, regardless of what prevention method you're using.
Fleas peak in summer too, and fleas carry tapeworm
Tapeworms have a slightly different route into your dog. They're often transmitted via fleas. A dog grooms itself, accidentally swallows a flea carrying tapeworm larvae, and that's enough. Fleas are at their most active during the warmer months, which means tapeworm risk rises in tandem.
Giardia loves warm, wet weather
Giardia, the microscopic parasite that causes persistent digestive issues and can spread to humans, thrives in damp environments and contaminated water. Dogs that swim, drink from puddles, or mix with lots of other dogs are at increased risk, and summer brings all of those opportunities in abundance.
So what should you do?
If you're already testing regularly, great. The warmer months are a particularly good time to make sure you're not letting that lapse. If your dog is more active outdoors between spring and autumn, consider testing more frequently than the standard four times a year.
And remember: a dog that looks perfectly fine can still have a worm burden building up quietly in the background. That's true in any season, but it's worth keeping front of mind during the months when exposure is highest.
