Giant breeds have specific nutritional need difference from regular sized dogs - they have a slower growth cycle (2 yrs vs 1 yr), need less fat and protein as puppies to control their growth rate and prevent puppyhood obesity that can lead to joint and bone disorders. They are also susceptible to bloat, or gastric torsion. No one knows what causes the bloat. Genetics certainly play a role, in that the giant breeds are the ones who get it. People have suggested raised feeders, not allowing a lot of water to be drunk after eating, certain food ingredients, etc. But the upshot is no one really knows. However, now that vets are doing laparoscopic procedures just as human surgeons are, they are making prophylactic gastropexy for these giant dogs. The procedure tacks the stomach to other structures to prevent it from being able to twist. The risk of torsion goes up with age, and can kill a dog very quickly, so it is a major concern.
Samson starts a couple of private puppy lessons next week, and will do puppy classes for socialization starting later in the month.