It’s a dog with two tails.
I don’t know what else to tell you. This ‘fantastic beast’ is a dog, and making the D&D stats took two minutes….
Crup

There’s nothing about this thing that makes it different from an actual dog. All I did was shrink the pre-existing ‘mastiff’ stats down to a terrier-scale creature.
As I said: it’s just a dog. But I’m determined to make all of these creatures.
Thank You For Reading
If you want more interesting Fantastic Beasts ready for D&D, click here.