You should get a Furminator brush for your dog, cause that is a shit ton of hair in the back seat. I have 2 Golden Retrievers and they are hair factories and the Furminator does a good job of controlling their hair. So far the M5 has been off limits for them.
2013 ///M5 Singapore Grey / Full Individual Cohiba Interior
2000 ///M5 Oxford Green / Extended Caramel Interior - Comfort/Active Seats|Chrome Line|Badge Delete|Alcantara Trunk|Hi End Rear Console & Equipment