Beyond the eyes, the Chow's list runs to hip and elbow dysplasia, thyroid disease, diabetes, bloat and stomach cancer. The Akita's is autoimmune disorders, hypothyroidism, progressive retinal atrophy, hip dysplasia and bloat.
The overlap is worth noting: both breeds carry hip dysplasia, both carry thyroid disease, and both are deep-chested enough for gastric dilatation-volvulus to be a genuine emergency risk. Every household with either dog should know the signs — unproductive retching, a distending abdomen, restlessness — and know where the nearest out-of-hours surgery is in advance.
Heat is the other shared limitation and the Chow has it worse. A thick standing coat, a relatively short muzzle for its skull and a heavy ruff make it a poor heat regulator, and Chows overheat faster than their activity level suggests. Summer walks move to early morning and late evening for both breeds.
Neither coat should ever be clipped. It insulates against heat as well as cold, and a clipped double coat frequently grows back with a damaged texture that insulates worse than before.
Lifespan is 9 to 15 years against 10 to 13 — a wider range, with well-bred Chows often at the upper end.