Truck seat cover recommendations

I have been through two Mud River blankets. Only get two years out of them because they start to smell. Tried hosing off, scrubbing, fabreeze, sun’ing for long periods, and throwing in a washing machine (Mud River says don’t do that).

Trying a WeatherTech blanket this year. They say it is washable.

I need the blanket style so I can pull it in/out easily. Dog is wet in the back seat 3 days a week, so have to pull it out to dry often. I don’t like the U styles in case I have to load gear in the rear.