My bernese mountain dog only has a white line from her nose to between her eyes. You don't see too many like that. Is that normal? Or could she be mixed?
A: The AKC Standard calls for a White Muzzle and Blaze. It's doesn't mean she's not a purebred though, many dogs are mismarked - It just means she doesn't qualify for Conformation Showing.
Here is the standard for Color and Marking:
Color and Markings
The Bernese Mountain Dog is tri-colored. The ground color is jet black. The markings are rich rust and clear white. Symmetry of markings is desired. Rust appears over each eye, on the cheeks...

Comments: 3
don't most homes have air conditioning?
I think it will be ok if you air condition your house. They have extremely thick coats, and do best in chilled air. If you don't have an air condition, you might have to consider shaving them
I haven't had any problems with my bernese mountain dog.