It took him a moment, however, to realize that it was the same thing.
He was sure that “it” had been killed on Main Street and also that “it” had been at most the size of an adult elephant.
The thing that Sigma and Assassin stared up at with the beginnings of a cold sweat . . .
Was Kerberos, the three-headed guard dog of Hades, grown larger than a house.

Fate/Strange Fake: Volume 6, Interlude ("Mercenary, Assassin, Pale Rider")