Lifespan
In UK vet records the Briard lives longer: a median of 12.6 years, against 11.3 for the Bouvier des Flandres.
Shedding
Their coats shed differently: the Bouvier des Flandres holds loose hair until it is brushed or clipped out, the Briard sheds through the year.
Grooming
The Briard needs more grooming, daily brushing, where the Bouvier des Flandres needs a brush once a week.
Temperament
They differ most on intelligence (Bouvier des Flandres: learns readily, likes games; Briard: needs daily brain work) and on sensitivity (Bouvier des Flandres: hardy, takes a busy home in its stride; Briard: average).
Alike
They are much the same size as adults, about 34 kg (76 lb) for the Bouvier des Flandres and 35 kg (77 lb) for the Briard.
Alike
Both are rated the same on loyalty: sticks close to its people.