Blood-vessel cancer (much more likely); Elbow joint disease (much more likely)6,7
Class
Working
Watchdog
Which suits you
Size
The German Shepherd is larger: about 38 kg (84 lb) as an adult, against 25 kg (55 lb) for the Belgian Malinois.
Temperament
They differ most on affection (Belgian Malinois: likes its own space; German Shepherd: affectionate on its own terms) and on prey drive (Belgian Malinois: likely to chase small pets; German Shepherd: chases; needs managing).
Alike
Both are rated the same on independence: keen to work with you.
Neither is the better dog in general. Which suits you depends on your home, your days and the care you can give.
Breed explains only about 9% of how individual dogs differ in behaviour8. Meet the dog. A good breeder breeds for temperament as well as health, and matches each puppy's personality to the right home9,10.
Puppy growth
Reference curves · both sexes
Summary
Detail
The German Shepherd grows to the heavier adult, about 38 kg against the Belgian Malinois's 25 kg.
Expected weight in kilograms, both sexes: each breed's adult weight grown along the 15–30 kg band of a WALTHAM growth standard11 and the 30–40 kg band of a WALTHAM growth standard11.
Barry et al., 2025. Epidemiology of haemangiosarcoma diagnosed in dogs under primary veterinary care in the United Kingdom: Frequency and risk factors. CC BY 4.0. ↑