AI-rewritten: This is a summary of an article from The Conversation, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story.

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The author, a neurotoxicologist who studied her grandmother’s dementia, explains that Alzheimer’s disease is hard to study because symptoms often appear two decades after the disease begins developing. Consequently, researchers usually rely on mice to test potential therapies. However, drugs that work in mice rarely succeed in human trials, with 99% of promising lab treatments failing in clinical tests. Additionally, mice do not naturally develop the misshapen proteins found in human dementia brains, making it difficult to replicate every aspect of the disease in a single animal model.

To overcome these limitations, scientists are investigating aging dogs as a natural model for neurodegenerative disease. In newly published research in the journal npj Dementia, the author and colleagues found that aging dog brains change similarly to human brains with dementia. The study involved brain samples donated by owners of older dogs who had died naturally or were euthanized to prevent further decline. Using standard lab analysis methods, researchers identified abnormal protein deposits in the same brain regions as those seen in early-stage human Alzheimer’s disease.

The team also examined blood markers, finding that dogs with high levels of brain protein deposits showed unusually elevated glial fibrillary acidic protein (GFAP). GFAP is normally found only in the blood during brain injury or disease, suggesting it could serve as a promising biomarker for diagnosing cognitive decline in both dogs and people. This research supports the idea that companion dogs can help researchers develop better diagnostics and treatments for dementia. The work is part of broader efforts like the Dog Aging Project, which studies over 50,000 dogs to understand factors influencing whole-body aging, including the brain.