f you run a daycare or boarding facility, you already know how important it is to keep the dogs happy, active and healthy. Group play is often at the heart of what a facility offers, as it gives dogs much-needed socialization and exercise, and it keeps pet parents coming back. But as any experienced operator will tell you, managing group play isn’t just about fun; it’s also about managing risk.

One of the biggest invisible threats in a group play setting is Giardia. This microscopic parasite is more common than people realize, and can spread quickly in the kind of social, shared environments that make daycare so enjoyable.

What Exactly Is Giardia?

Giardia is a single-celled parasite (not a worm or bacteria) that lives in the intestines of dogs and other animals. Dogs pick it up by swallowing microscopic cysts, usually from contaminated water, shared surfaces, or even just from licking their own paws after playing in an area where another dog has shed the parasite.

It spreads through the classic fecal-oral route, but unlike some other parasites, Giardia doesn’t always cause symptoms. That’s a big issue, because a dog can seem perfectly healthy while still shedding cysts and exposing others during play, mealtime or just sniffing around the yard.

When symptoms do show, it’s usually GI related, such as soft stool or bouts of diarrhea, and maybe some weight loss or less interest in food. But again, most dogs don’t show any symptoms at all.

Why Does It Spread So Easily?

Unfortunately, the nature of boarding and daycare—shared yards, toys and water bowls, as well as tight playgroups—makes it easy for Giardia to get passed around, even in a spotless, well-managed facility.

Here are a few reasons why:

• Giardia cysts are surprisingly resilient. They survive for weeks in damp or cool conditions.
• Dogs being dogs; they lick, sniff, roll and interact in ways that practically invites transmission.
• A lot of standard disinfectants won’t kill Giardia. You need to use the right ones or methods like steam-cleaning to kill it.

So, even if your staff is cleaning constantly and your playgroups are well-supervised, you can still end up with Giardia if you’re not testing regularly.

Why Is Testing So Important?

Since most infected dogs look totally fine, it makes it tough to identify where it’s coming from. By the time a dog shows signs, you might have already had multiple exposures in your group. That’s why regular fecal testing is so important—it’s really the only way to catch asymptomatic shedders and stop the spread before it starts.

Fecal testing shouldn’t be something you just do when a dog has diarrhea. If you’re running group play, it should be a part of your preventative health program. Whether you decide to require testing for new clients or put all active dogs on a regular schedule (every six months is a good place to start), it’s going to pay off in fewer outbreaks and healthier packs.

The most reliable testing is done by veterinary diagnostic labs using zinc sulfate flotation with centrifugation. This is the test recommended by the Companion Animal Parasite Council, which should be done every six months for all adult dogs. And if you want pet parents to follow through, you have to make it easy by providing collection kits, sending reminders and helping them understand why it matters.

What Are Some Other Ways to Prevent It?

Aside from testing, here are a few other measures that can be taken to help reduce risk:

• Switch from shared water bowls to individual ones.
• Clean up stool immediately and disinfect the area with something that’s proven to kill Giardia.
• Wash toys and sanitize turf and high-traffic areas often—especially after rain.
• Train your staff to understand how parasites spread and what to look for.
• Keep clients in the loop. Education goes a long way toward prevention.

The more you do to keep the environment clean and clients informed, the better off everyone’s going to be.

How Can This Protect Your Reputation?

Nobody wants to be the facility where someone’s dog got sick. Even if it’s handled quickly, it can take a long time to rebuild trust. On the other hand, being known as a facility that takes health seriously can actually help your business. Clients appreciate it when you’re proactive, and many will gladly support testing programs when you explain the benefits.

In addition, some businesses could even make a small profit from testing by bundling it into onboarding fees or monthly wellness packages. Whether you charge for it or not, offering testing is a smart move from both a health and business standpoint.

Giardia is common, it spreads easily and it’s often invisible. But that doesn’t mean you can’t stay ahead of it. Regular fecal testing, smart cleaning routines, and clear communication with clients and staff go a long way in protecting your facility and the dogs who come there. You’re already doing the hard work of keeping dogs happy and engaged, this is just one more way to keep them safe and healthy, too.

John Beres, DVM, is a veterinarian and the founder of Canine Lab Testing, a service designed to help daycare and boarding facilities make fecal testing simple, fast, and client-friendly. With almost 20 years in practice and a strong focus on prevention, Dr. Beres works with pet care businesses across the country to improve parasite screening and keep group play safe. You can learn more at caninelabtesting.com