Hi Alan, it's Jack at Dyson.
Like all Dyson upright vacuums, DC41 Animal includes a motor-driven rotating brush bar. This includes stiff nylon bristle tufts which sweep into the carpet pile, agitating out dust, grit and stubborn pet hair. This will also have the effect of raising the carpet pile where it's been trodden down from daily use - this is what causes the tracks you've noticed. You can see how DC41's brush bar and cleaner head are engineered to work in the video I've attached.
It is possible to turn off the brush bar using the silver brush control switch next to the red on/off switch. However, the brush bar is an important factor in effective carpet cleaning and we would always recommend vacuuming carpets with the brush bar turned on - with the exception of delicate carpets or rugs.
It does sound like your machine is working correctly, in the way it was designed. I hope this information is useful to you, but if you would like some further advice, please give us a call on 0800 298 0298 (UK), or 1-866-693-9766 (US).
Best wishes,
Jack
Dyson Online Customer Support
www.dyson.com
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