Yzer is just how a real Boerboel should be this strong structure supported by big muscles allows him to move this serious weight with such power, efficiency and athleticism.
At 19 months of age he has the perfect size and proportions 70 cm height, 69 kg weight, 69 cm head and 69 cm neck (head and neck will thicken once he's fully matured and I expect him to gain another 5 kg of weight).