The mainstream ones:
-Male
-Female

The limited-grand spectrum:
-Doggo
-Dogger
-Doge
-Dog
-Dug
-Douge
-Doug

The internal/external branch:
-Pupper
-Pup
-Puppy
-Poo
-Pooper
-Puppo
-Poopee
-Pomper

Neo-pronouns era:
-Woof
-Woofer
-Worf
-Bork
-Burk
-Bonk
-Warf
-Bark
-Snorf

Don't forget about the gender confusions! These can go from
-Doggo/Pupper/Woof
To:
-Douge/Dug/Doug/Puppo/Pomper/Puppy/Worf/Woofer/Bork/Brack/Snorf
And many more!
Thanks for reading guys!