The two health profiles have almost nothing in common.
The Akita's burden is immune and endocrine: autoimmune disorders affecting skin, eyes and blood, hypothyroidism, progressive retinal atrophy, plus hip dysplasia and bloat as a deep-chested large breed. Akitas are also known for sensitivity to some anaesthetic protocols, which is worth flagging to any vet before a procedure.
The Boston's list is structural and ocular: brachycephalic airway syndrome, patellar luxation, cataracts, corneal ulcers, and congenital deafness. The prominent eye is exposed and corneal injuries are common — a scratched eye in a Boston is a same-day vet problem, not a wait-and-see one.
Ask a Boston breeder for BAER hearing testing and eye certification on the parents. Ask an Akita breeder for hip scores, thyroid panels and eye testing.
Lifespans are close, 10 to 13 against 11 to 13, which is unusual for a size gap this wide.