The dog blog

Dogs and humans may have more in common when it comes to aging than scientists realized. Researchers with the Dog Aging Project found that patterns of small molecules in dogs’ blood were linked to longer or shorter lifespans in remarkably similar ways to those seen in people. These metabolic “fingerprints” could offer clues about the biological processes that drive aging, including metabolism, inflammation, and cellular stress.

Scientists tracking thousands of animals found that our physical presence can reshape where wildlife moves and lives, sometimes as strongly as roads, cities, and other human development. Because different species reacted in very different ways, conservation efforts may need to become much more targeted.

A sweeping analysis of thousands of animal genomes suggests that chromosomes do not evolve randomly but instead follow a limited number of irreversible “evolutionary highways.” These one-way genetic changes preserve clues to more than 600 million years of animal history and could even help researchers explore where evolution may head next.

Backyard bird feeders could become unexpected hotspots for H5N1 as Australia’s bird flu outbreak spreads, bringing species together in ways that rarely occur naturally. Experts say stopping feeding is safest, while smaller amounts of food, no hand-feeding, and careful cleaning can reduce the danger.

Dogs may understand our emotions more deeply than scientists realized. Brain scans show that happy human faces activate regions in dogs linked to higher-level processing and reward, suggesting that smiles carry special emotional significance for them.