Okay, I've known for a while that what I think Mouse looks like isn't exactly canon, but I'm wondering how exactly fanon pictures mouse generally.

Myself as example:

I know in canon Mouse is supposed to be a Foo Dog, and so look something like a chow ( http://en.wikipedia.org/wiki/Chow_Chow ). To me, however, this is impractical (grooming issues, for one, for another they aren't particularly active) and doesn't fit the idea of a dog that goes with Harry to battle the fae/latest baddie.

Instead, I think of this breed: http://en.wikipedia.org/wiki/Rhodesian_Ridgeback
An african breed for hunting lions (instead of being a "lion-dog") that seems to fit Mouse, especially when you look at the temperament (here: http://en.wikipedia.org/wiki/Rhodesian_Ridgeback#Temperament ). This, especially, reminds me of Mouse:
"Ridgebacks are strong-willed, intelligent, and many seem to have a penchant for mischief, though loving. They are protective of their owners and families. If trained well, they can be excellent guard dogs."

(Also, the 8-month picture is, to me, the perfect image of Mouse.) :)