Someone who is completely and utterly incapacitated by the cuteness of pups, woofers, and dogs alike.

The kind of person who makes up an urban dictionary entry for the sake of a tinder profile... all in the name of dogs of course..

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

It's pretty self-explanatory

a stupid idiot who is too dumb to see that cats are better