Christopher is a long name for a dog. Five syllables, formal, carrying the full weight of a baptismal name that hasn't been abbreviated. That length is almost certainly the point. Owners who choose Christopher are making a very specific comedic or sentimental bet.
The Five-Syllable Dog Name Comedy
Christopher sits at the extreme end of the formal-human-name genre. Calling a dog across a park — "Christopher! Come!" — has a theatrical quality that shorter names can't achieve. It works as either genuine tribute (named for a family member) or deliberate absurdist humor. The baby name Christopher was among the most popular boys' names of the 1970s-80s, so a lot of owners grew up with Christophers they loved.
Winnie-the-Pooh and the Other Christopher
Christopher Robin — A.A. Milne's boy in the Hundred Acre Wood — is the most famous literary Christopher in children's culture, and he's inseparable from a beloved stuffed bear. Owners of Golden Retrievers or honey-colored dogs sometimes reference this thread consciously.
Registry Honesty
Forty-two registrations at rank 2249 means every Christopher was typed deliberately. It's a name that requires commitment. The owners who chose it clearly have it.