The Wessel Werk EBK360 head is a very powerful deep cleaning head. Only issue with this head is that the brush roll opening is completely open with no rug guards. For Wall to Wall carpet that will be wonderful, for lots of area rugs, that will be a huge nuisance as it will look to eat edges of all area rugs!!! It's more powerful than the EBK340. Both of the Wessel Werk heads are open on bottom.
For a very powerful power nozzle system I would recommend looking to the Riccar/ Simplicity style power nozzle. It has a wonderful height adjustment system, easy rolling rubber coated wheels, belt/ motor protection system. Picture of one is below.
I wish you the best of luck with the Sebo D4. I worked for a client that purchased one and I tried it brand new out of the box. I liked the long cord, it was quiet and the filtration was good. However, I found the cleaning power of the machine awful. I never thought it had good airflow with bare floor tool or power head and I found the power head very weak. I also couldn't stand the teeny on/off switch button on power nozzle and the height adjuster was useless. When you get tired of using it, I recommend the Simplicity or Riccar. The Moxie, Gusto, Verve, Prima, Wonder are all great machines with lots of power. I am a power nozzle canister lover and all of the cleaning clients have canister vacs in their homes. I've never had more frustration and lack of cleaning power from another canister vac more than the Sebo D4!!!
I will attest that the newest Rainbow E2 is terrific. You may think I'm biased cause I now sell them, however I only started selling them because I realized how fantastic they were which is what made me purchase one and I did not get any special treatment for being an employee. I did lots of testing on Rainbow when friends worked to persuade me away from selling Filter Queens to the Rainbow. My Rainbow runs round the clock as air cleaner, it's my vacuum, spot scrubber, humidifier, kitchen exhaust fan, aromatizer, floor washer, with exception of toilet bowl and dishes there is really nothing in a house a Rainbow can't clean.
The link below is for a bare floor tool that relies more on air flow rather than on the bristles. It will do quite well at picking up your dog hair and get sucked in immediately rather than being caught on bristles. You may be able to see if your local vacuum dealer has a similar attachment that rolls smoothly and is designed for hard flooring with out all of the bristles. For very heavy dust or to get the floors looking terrific with out mopping the Riccar Soft Sweep tool with horse hair bristles and microfiber pad are fantastic!!! Or a generic horsehair bare floor brush will do great!!
http://www.centralvacuumstores.com/central-vacuums/acc/CT150B-Deluxe-Floor-Rug-Tool.php
