Cognitive Dysfunction Syndrome (CDS) is a progressive neurodegenerative condition common in aging dogs and cats. It’s often compared to human Alzheimer’s disease. A recent study highlighted the benefits of brain-protective mushroom blends in improving cognitive function and sleep patterns.
At the Parsemus Foundation, we know that understanding and addressing CDS is critical for enhancing the quality of life in aging companions. Emerging research points toward promising natural approaches that support brain health. Here’s what the science says.
What is Cognitive Dysfunction Syndrome (CDS)?
As our beloved pets age, many families notice changes that go beyond “slowing down.” Disorientation, altered sleep patterns, reduced interaction, and forgetfulness are common — and they’re not just quirks of getting older. These signs can indicate cognitive dysfunction syndrome (CDS), a progressive brain disorder in older dogs and cats.
CDS is a neurodegenerative condition that affects memory, learning, awareness, and daily behavior in older pets. Veterinarians often describe it as “pet dementia” because of its similarities to human Alzheimer’s disease. In fact, elderly cats develop both amyloid and tau pathologies that are hallmarks of human Alzheimer’s disease.
- In dogs, common symptoms include disorientation, changes in interactions or sleep, house-soiling, anxiety, and loss of learned behaviors.
- Cats may show increased vocalization, altered sleep cycles, decreased sociability, and confusion.
Age-related oxidative stress, inflammation, and reduced neural regeneration are believed to contribute to CDS. The condition becomes more prevalent as pets reach geriatric ages. A 2009 study indicated that 22% of dogs over 9 years of age had cognitive impairment. In cats, approximately 28% of cats aged 11–14 years are affected. Neutering is associated with higher CDS levels in both cats and dogs. (For more information on the health impacts of spaying and neutering, see our webpage).
Traditional and nutritional support for cognitive dysfunction syndrome
Veterinary approaches to cognitive decline in pets first involve ruling out other medical issues, such as endocrine diseases or hearing and vision loss. For CDS cases, treatment may include medications (such as selegiline or anti-anxiety drugs), environmental enrichment, and therapeutic diets or supplements.
A 2025 review of the impact of enriched diets and nutraceuticals on cognitive function in dogs and cats concluded that several supplements may offer benefits. Studies have shown that Omega-3 fatty acids, especially at higher doses, can improve cognitive function in pets. Antioxidants and vitamins E and C alone were less effective but enhanced the impact of omega-3 fatty acids.
For example, a controlled clinical trial in dogs reported that nutrients such as omega-3 fatty acids, antioxidants, B vitamins, arginine, and medium-chain triglycerides (MCTs) improved cognitive function.
We don’t yet know how dietary supplements affect the brain. They may improve lipid metabolism in the brain, reduce amyloid plaques, or enhance mitochondrial function.
Medicinal mushrooms: a growing evidence base
Traditional medicine has valued mushrooms for centuries for their antioxidant, anti-inflammatory, and neuroprotective properties. Modern research is now beginning to validate these effects in the context of cognitive health.
Bioactive compounds found in mushrooms — such as ergothioneine, erinacines, beta-glucans, and cordycepin — may help reduce oxidative stress, support nerve growth factors, and modulate inflammatory processes relevant to neurodegeneration.
Several mushroom species commonly used in supplemental formulations for humans and pets include:
- Hericium erinaceus (Lion’s Mane) — known for stimulating nerve growth factor (NGF) synthesis and supporting neuronal resilience.
- Ganoderma lucidum (Reishi) — noted for immune modulation and anti-inflammatory effects.
- Trametes versicolor (Turkey Tail), Lentinula edodes (Shiitake) — have supportive antioxidant compounds.
New research on mushroom nutraceuticals in canine cognitive dysfunction
A 2025 proof-of-concept study titled Evaluation of a Mushroom-Derived Nutraceutical for Canine Cognitive Decline evaluated a proprietary mushroom extract in aging dogs showing signs of cognitive decline. Thirty dogs participated in the study, which included owner surveys, biomarker measurements, and activity monitoring.
Key findings included:
- 59% of dogs demonstrated measurable cognitive improvement, and an additional 23% remained stable, a notable finding given that CDS is typically progressive.
- Objective sleep and activity data — captured via wearable collars — showed improvements in sleep efficiency and reduced nocturnal restlessness.
- Exploratory biomarker trends (e.g., decreases in C-reactive protein and increases in brain-derived neurotrophic factor) aligned with improvements in cognitive and behavioral scores.
- The supplement was well tolerated with no adverse events reported.
Importantly, dogs with moderate CDS signs showed the most robust response, suggesting that earlier intervention may yield greater benefit.
What this means for pet owners
While researchers still require larger, controlled clinical trials, early evidence suggests that mushroom-based nutraceuticals support cognitive health in aging pets. These compounds work through multiple mechanisms — including antioxidant support, modulation of inflammation, and neurotrophic signaling — to target the drivers of age-related cognitive decline.
Veterinarians may consider these nutraceuticals as part of an integrative care plan for pets with mild to moderate cognitive dysfunction, especially when combined with environmental enrichment, routine veterinary monitoring, and therapeutic nutrition.
Takeaways on mushrooms for CDS
Cognitive dysfunction syndrome is a common and impactful condition for aging cats and dogs. While there’s no cure, emerging research highlights the role of targeted nutrition — including mushroom-derived nutraceuticals — in supporting brain health and slowing cognitive decline.
At the Parsemus Foundation, we’re encouraged by these developments. Natural, science-informed interventions that enhance quality of life for aging pets are a promising frontier in pet health, and mushrooms may play an important role in that future.
For more information, see our pet health articles.
