Eight seconds wouldn't be a problem, after all there are no areas which you need to dodge. After you get the light areas right, increase the grade a bit to get the dark areas of the background sorted out and adjust the time to keep the fur white with details.

Did you see Mr.Carnie's very interesting thread, above this sub-forum, as a sticky. . .

http://www.apug.org/forums/forum41/8...-darkroom.html