How ReNu Works


is a waterless grooming system designed to clean, refresh, and de-shed your pet in under 10 minutes. No tub, no rinsing, no bath-time battles. Here's how it works.

The three-step process

Step 1 - Spray the cooling mist

Fill the brush reservoir with water and FreshFur Cleansing Mist. With one press, the brush releases a fine, cooling mist that lightly moistens your pet's coat. The mist is soft enough that most pets don't react to it the way they do to a spray bottle.

Step 2 - Brush to clean and deodorize

As you brush, the soft silicone bristles work the mist through the coat. This does two things at once: it lifts dirt and dander from the skin, and it neutralizes odor at the source instead of masking it. See the full ingredient breakdown for why the formula works this way.

Step 3 - Eject the loose fur

Press the button on the brush to eject the collected hair into the trash. The coat air-dries naturally within minutes. No towels, no rinsing, no wet-dog smell.

What makes it different from other brushes

Most waterless brushes you find online are plastic combs with a spray bottle attached. They're built cheap, filled with diluted formulas, and often contain ingredients that irritate skin or dry out the coat.

ReNu is a vet-formulated grooming system, not a generic dropship product. A few things that set it apart:

  • Quiet operation — no loud motor that makes pets run for cover
  • Soft medical-grade silicone bristles — flexible enough for sensitive areas
  • pH-balanced cleansing mist — won't strip natural coat oils
  • One-click fur ejection — cleanup takes seconds
  • Safe for sensitive skin and all coat types

Dig into the research behind our formula on our Backed By Science page.

Does it replace traditional bathing?

For everyday cleaning, yes. The pH-balanced formula lifts dirt and neutralizes odor without stripping the natural oils from your pet's coat. Most customers find they need traditional baths far less frequently after switching - read their experiences on our Reviews page.

For really dirty situations (your dog rolled in something truly foul), you'll still want a traditional bath occasionally. ReNu is for the day-to-day, not the emergencies.

Who it's built for

ReNu is designed for:

  • Anxious pets who panic around water and traditional baths
  • Senior pets who can't handle being lifted into a tub
  • Cats, who generally consider baths a personal insult
  • Pets with allergies or sensitive skin
  • Heavy shedders, especially double-coated breeds
  • Pet parents who are tired of the weekly bath-time fight

Have questions about whether it's right for your specific pet? Check our FAQ or contact our team - we'll help you figure it out before you buy.

Our 90-day guarantee

Try ReNu risk-free for 90 days. If it doesn't make grooming faster, easier, and less stressful, we'll refund your order. No questions asked. Read the full Refund Policy.

Ready to try ReNu?

Shop the FreshFur Shower Brush or explore our best sellers. Every purchase is backed by our 90-day money-back guarantee.