Immune Support for Dogs: Mushrooms, Colostrum and a Healthy Gut
Your dog’s immune system never takes a day off.
Every sniff, every lick, every mouthful of dinner, it’s quietly checking what’s a friend and what’s a threat.
When it’s working well, you barely notice it. When it’s struggling, you start seeing it everywhere. The ear infections that keep coming back. The itchy skin every spring. The tummy that flares at the smallest change. The older dog who takes longer and longer to bounce back.
In this post, I’ll explain why so much of your dog’s immunity starts in the gut, and walk you through the three immune-support supplements I trust most: Mushroom Elixir, Pure Turkey Tail and Pure Colostrum.
Why modern dogs need more immune support
Today’s dogs deal with a lot their ancestors never did:
Sprays on the grass they roll in, sniff and walk through every day
Household chemicals, cleaners, air fresheners and fragrances, and our dogs live nose-down at floor level
Highly processed food, often eaten every day for a lifetime
Traffic fumes and air pollution, especially for city dogs
Repeated courses of medication like antibiotics, which can upset the balance of good gut bacteria
Stress, from busy households, long days alone, or noisy environments
None of these on its own is a disaster. But the immune system has to handle all of it, every single day, and that load adds up.
Be proactive, not reactive
Most of us only think about the immune system once something’s already off. An ear infection, an itchy flare, a tummy upset. By then, we’re playing catch up.
I’d much rather be proactive. Giving the immune system some extra support every now and then, while your dog is well, helps keep it resilient for when life throws something at it.
It’s a bit like servicing your car before it breaks down, not after.
The foundations always come first: fresh, real food, a healthy gut, plenty of movement, good rest and a calm home. On top of that, a few well-chosen supplements can give the immune system some extra backup.
Where does your dog’s immune system live?
Short answer: a lot of it lives in the gut.
Your dog’s gut lining is the biggest meeting point between their body and the outside world, so it’s packed with immune tissue.
Its job is to sort friend from foe. Food and good bacteria get a pass. Bugs that cause trouble don’t.
When that system is balanced, it stays calm and does its job quietly.
When it’s out of whack, it either under-reacts (think recurring infections) or over-reacts (think itchy skin, allergies and touchy tummies).
That’s why I talk about balancing the immune system rather than “boosting” it.
Most dogs don’t need a louder immune system. They need a smarter one.
Want to go deeper? Read more about the importance of gut health for dogs.
How medicinal mushrooms support your dog’s immune system
Medicinal mushrooms contain beta-glucans, complex sugars found in their cell walls.
Immune cells in the gut lining have receptors that recognise beta-glucans.
Think of it like a training drill. The immune system gets a regular workout that keeps it alert and sharp, without tipping it into overdrive.
That’s why mushrooms are called immune modulators. They help nudge the immune system towards balance, whichever direction it’s drifting.
Can dogs just eat mushrooms instead?
Not really. Mushroom cell walls are made of chitin, which dogs don’t break down well, so most of the good stuff stays locked inside. A proper extract is what gets it out.
And please never feed wild mushrooms. New Zealand has some seriously toxic species, including the death cap.
Mushroom Elixir: the all-rounder
Five medicinal mushrooms in one easy liquid:
Reishi: the calm one. Traditionally used for immune balance and settling inflammation.
Shiitake: contains lentinan, one of the best-studied mushroom beta-glucans.
Maitake: traditionally prized for immune support and vitality.
Turkey Tail: the gut and immune all-rounder (more on this one below).
Cordyceps: traditionally used for energy, stamina and recovery.
Great for
Healthy dogs who could use some extra support
Senior dogs
Dogs bouncing back after illness
Busy social dogs (daycare, boarding, group walks, dog parks)
Pure Turkey Tail: focused and gut-friendly
If the Elixir is the whole band, Turkey Tail is the lead singer.
It’s one of the most researched medicinal mushrooms in the world, and it pulls double duty:
Immune support: rich in beta-glucans, plus two well-studied compounds called PSK and PSP.
Gut support: early research suggests Turkey Tail acts like a prebiotic, helping feed the good bacteria in the gut. Happy gut bugs, happier immune system.
Great for
Dogs where the gut is a big part of the story
Dogs who need more focused, single-mushroom support
Elixir or Turkey Tail? The Elixir already contains Turkey Tail, so most dogs don’t need both at once. Pick the Elixir for broad, all-round support. Pick Turkey Tail when you want a focused, gut-leaning option.
If your dog has a cancer diagnosis, please talk to your vet before starting any mushroom product, and get in touch so we can look at the bigger picture together.
Pure Colostrum: the gut-and-immune multitasker
Colostrum is the first milk a mother produces after giving birth. It’s nature’s starter kit for a brand new immune system.
Bovine (cow) colostrum is loaded with:
Antibodies (immunoglobulins like IgG)
Lactoferrin, a protein that helps keep unwanted bugs in check
Growth factors that support repair of the gut lining
And remember, the gut lining is the immune system’s front line. Support the wall, support the guards.
What the research says about colostrum for dogs
A 2013 study followed 24 adult dogs for 40 weeks. The dogs given colostrum had:
A stronger response to their distemper vaccine
More IgA in the gut (a key marker of gut immune activity)
More diverse and more stable gut bacteria
Small study, but a really nice result, and it lines up with what I see in practice.
Why I like it
First-milking colostrum, freeze-dried at low temperatures
28-32% IgG
Single ingredient. No fillers, no additives.
Fully traceable from grass-fed farms
Great for
Allergy-prone dogs
Sensitive tummies
Recovery after illness or a course of medication
Puppies settling into a new home or a new diet
Senior dogs
How to use: 1 flat scoop (¼ tsp) per 10 kg bodyweight, once daily in food. Don’t heat it. Add it to room-temperature food only, as the good stuff is heat sensitive.
Skip it if your dog reacts to beef or dairy.
Before you start
Start with a small amount and build up over a week.
Check with your vet first if your dog:
is on immune-suppressing medication (like steroids or cyclosporine), blood thinners or diabetes medication
has an autoimmune condition
has surgery coming up
is pregnant or feeding puppies
Supplements support a good diet. They don’t replace one. Fresh food and a healthy gut come first.
How I use these with my own dogs
People often ask me what I actually do with my own dogs, so here it is.
I don’t give them everything at once, and I don’t keep them on immune support all year round. Instead, I use one product at a time and give each one its moment.
Pure Colostrum first. I start here because it supports the gut lining, and that’s the foundation for everything else. I use it until the tub is finished.
A break of a few weeks. This gives their bodies time to settle and do their own thing.
Mushroom Elixir or Pure Turkey Tail next. I alternate between these two each time around, and again, I use it until the bottle is finished.
Another break of a few weeks.
Back to Colostrum, and around we go again.
I like to think of it as pulsing. Each supplement gets a focused run, then a rest, and the next one comes in with a slightly different kind of support.
It’s simple, it’s easy to keep track of, and it means my dogs get regular, proactive support without being on a long list of supplements every day.
A quick note: this is just the approach that works for my dogs. Every dog is different, so if yours has health issues or is on medication, it’s worth getting tailored advice first.
Frequently asked questions
What is the best immune support for dogs?
Start with the foundations: fresh, real food and a healthy gut. On top of that, medicinal mushrooms and bovine colostrum are two of the most useful options, as both work closely with the gut, where much of the immune system lives.
Are mushrooms safe for dogs?
Properly prepared medicinal mushroom extracts, like reishi, shiitake, maitake, turkey tail and cordyceps, are commonly used for dogs. Wild mushrooms are a different story. Never let your dog eat mushrooms found outdoors, as New Zealand has some highly toxic species.
Is colostrum good for dogs?
Bovine colostrum is rich in antibodies, lactoferrin and growth factors that support the gut lining and immune system. A 2013 study found dogs given colostrum had a stronger vaccine response and more stable gut bacteria. Avoid it if your dog reacts to beef or dairy.
Should dogs take immune supplements all year round?
Not necessarily. I prefer to give one product at a time until it’s finished, then take a break of a few weeks before moving to the next. It keeps support regular and proactive without overloading your dog with supplements every day.
Not sure which option suits your dog? Book a consultation and I’ll help you build a plan around their specific needs.
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