Similar to a gold digger,
A dog digger is someone who goes out with you for your dog(s).
Guy 1: What happen between you and Felecia?
Guy 2: I loved her, she only loved my dogs, so I said “bye Felecia” and set that dog digger back to her dog house.
A female that dates, establishes maintains relationships with a sole purpose to see someone else’s dogs or to get a dog as a gift.
She’s only with me to see my dog, she’s a dog digger!
A female that dates, establishes and maintains relationships with a sole purpose of being around dogs or getting a dog.
Man, she’s a dog digger. She only wants me for the dogs!