The Brittany's health list runs hip dysplasia, elbow dysplasia, progressive retinal atrophy, ear infections, hypothyroidism, allergies, epilepsy, heart murmurs, bloat and separation anxiety.
Ear infections are the most reliable recurring cost. Drop ears on a dog that swims and pushes through cover trap moisture, and the answer is weekly checks, cleaning as directed and thorough drying after wet work. Head shaking, scratching, odour or discharge means an appointment rather than more cleaning.
Progressive retinal atrophy is the entry with a test. It causes gradual loss of vision beginning with night blindness, and DNA testing is available in the breed, so a breeder should know both parents' status. Ask for it alongside hip and elbow scores.
Heart murmurs are worth a specific mention because they are easy to act on. A murmur picked up at an early vaccination appointment may be innocent or may be the first sign of a structural problem, and the distinction is made by echocardiography rather than by listening again in six months.
Epilepsy recurs in some lines and is a fair breeder question. Bloat is on the list, so split meals, quiet time around eating and a known out-of-hours route are sensible for a deep-chested sporting dog.
The Pit Bull's list is hip and elbow dysplasia, skin allergies, heart murmurs, bloat, obesity, cruciate ligament disease, arthritis and cancer. Skin allergies are its most common day-to-day complaint — paw chewing, ear trouble, itchy pink skin — and cruciate disease its most likely orthopaedic emergency.
Both breeds are helped enormously by staying lean, and that is the one variable entirely under an owner's control.
Lifespan slightly favours the Brittany at 12 to 15 years against 12 to 14, and both are good figures for athletic medium dogs.