Hagrid had once obtained a Norwegian Ridgeback egg from Quirrell, who had disguised himself as a passing traveler. In return, Quirrell had managed to get information from him on how to deal with Cerberus.
According to Dragon Breeding for Pleasure and Profit, female dragons breathed on their own eggs to keep them "warm."
Dragon's Breath was hot enough to melt rock into something like lava. Clearly, this so-called "warmth" differed "slightly" from the human definition. Hagrid's magic was not particularly advanced. He was not especially clever to begin with, and he had dropped out of school. His method of hatching the egg had been to roast it over a fire without stopping, and somehow, miraculously, it had worked.
Next came raising the dragon. It needed a bucket of brandy mixed with chicken blood every half hour, much like a mammal nursing its young. But how did real dragons feed their hatchlings?
Although Scamander had explained it, Pomona still had not figured out exactly where dragon cheese came from. She only knew that it contained large amounts of dragon fat. That made it easier to understand. Snakes had fat too, and ordinary snake oil was generally used as a topical medicine for treating frostbite.
And compared with the question of cheese, there were many more pressing things to worry about.
Once they had brought the Nifflers along, Apparition was no longer suitable. Fortunately, the Scamander family had other magical creatures. A wind dragon would take them back to Hogwarts.
This dragon was different from Drague at the Dragon Reserve. It did not excel in speed, but it could inflate itself like a balloon, making it very suitable for carrying people.
To own a Hippogriff, one needed to cast a Disillusionment Charm on it. But a Disillusionment Charm that worked on a