Several studies have shown that probiotics can help provide some protection against Giardia. While many studies about the importance of gut health have been done in humans, it may also be applicable to dogs.
The main probiotic strain that has displayed some anti-Giardia effects are those of Lactobacillus. Most probiotics for dogs do include a strain of Lactobacillus, and this is because certain strains have already been shown to help improve gut health, reduce diarrhea, and improve stool quality in dogs.
More studies are needed, as many of the mechanisms of what role probiotics play in Giardia infections are still unknown, but here are some ways shown in research.
How probiotics can help protect your dog against Giardia
1. Probiotics may protect against mucosal damage
When dogs have giardiasis, the organism is attached to the intestinal wall and wreaks havoc, which causes a lot of inflammation.
Research has shown that probiotics may have some antioxidant capacities to suppress oxidative products and regulate the immune response, thereby decreasing inflammation.
2. Directly targeting the parasite
Probiotics may actually be capable of reducing the Giardia load by destroying its cellular architecture
3. Suppressing growth and proliferation
One study showed that probiotics may also help to suppress the proliferation and growth of trophozoites by the production of some factors that are anti-Giardia.
What are some good probiotics for my dog?
- AnimalBiome Dog Probiotics (Shop Here)
- Pawfy Probiotic Soft Chew (Shop Here)
- Fera USDA Organic Probiotics with Prebiotics (Shop Here)
References
Key Research Studies
- Impact of Lactobacillus johnsonii CNCM I-4884 in Canine Giardiasis
Polack et al. showed that daily administration of the probiotic strain Lactobacillus johnsonii CNCM I-4884 significantly reduced Giardia cyst shedding in dogs, suggesting a potential complementary approach to standard antiparasitic therapy. - Anti-Giardia Effects of Lactobacillus casei
Experimental studies in mice found that oral administration of Lactobacillus casei before Giardia lamblia infection reduced parasite counts, decreased intestinal damage, and supported recovery of gut structure compared to controls. - Probiotic Modulation of Immune Response in Giardia Infection
In murine models, Lactobacillus rhamnosus GG (LGG) was shown to modulate mucosal immunity during Giardia infection, enhancing secretory IgA and anti-inflammatory responses. - Additional Evidence of Probiotic Anti-Giardia Activity
Multiple rodent studies report that probiotics such as Lactobacillus johnsonii, L. casei, and other strains can reduce Giardia cyst counts and trophozoite adherence, possibly via antimicrobial effects and competition for intestinal niches. - https://link.springer.com/article/10.1007/s00210-021-02124-z
- https://link.springer.com/chapter/10.1007/978-3-030-44826-4_24
