Bissell Little Green Pet Pro Portable Spot Cleaner (3909) Review

The Bissell Little Green Pet Pro is the big-tank workhorse in the Little Green line, and after running it through real messes it earned the Just A Dad sticker — it cleans excellently. But I'll be straight with you: it's the older, heavier design, the "Pet Pro" name promises more than it delivers, and there's a newer model I'd reach for first now. If you clean a lot at once, though, those big tanks are a real advantage. 

What's in the Box and First Setup

In the box you get the machine, the main spray/scrub tool with changeable bristles (a carpet-bristle set and a pet-hair set), a crevice tool that sprays a pinpoint stream and stores right on the unit, an extra bristle strip, and a sample bottle of spot-cleaner solution. There's a little assembly but nothing that needs a manual. One thing to know up front: this is the corded version with a 15-foot, three-prong cord, and the flexible hose adds about 5 feet of reach on top of that.

Setting Up the Tanks

There's no separate solution tank — the water and solution mix together in the clean-water tank, and this is where the Pet Pro is genuinely easy: it has clear fill lines, so you fill to the water line, then top up to the solution line, and the ratio comes out right every time. No measuring cup, no guessing. You can use hot tap water up to 140°F to help clean. When you're done, the dirty water collects in its own tank.

Cleaning Performance: What It Actually Picks Up

Suction and the Cleaning Demo

This is where it shines. I hit a big chocolate stain — sprayed it down with the pressurized stream, scrubbed while spraying, then ran the suction to pull it dry — and it did an excellent job. The stream is strong and even, and the 3.9-amp motor pulls hard enough to leave the spot nearly dry, not soaked. For real, set-in family messes, it cleans as well as anything this size.

The "Pet Pro" Reality

Here's the honest part: don't let the "Pet Pro" name oversell it. There's a little nub on the dirty tank that gathers hair you can pull off, and you can swap to a pet-hair bristle for couches — but that's about it. There's no roller and no special pet technology. The real pet cleanup comes from the strong suction and a good pet-oxy solution, which you'd get from other Little Greens too. It handles pet accidents well; just buy it for the cleaning power, not the pet gadgetry.

Corded Power and the Bigger Tanks

Like the rest of the line it's corded, so you're tethered to an outlet — but you get unlimited runtime and, more importantly here, bigger clean and dirty tanks than the minis. That means you cover more ground before you're running to the sink to refill and empty, which is the whole reason to pick this over a Mini if you do car detailing or back-to-back messes. The trade-off is weight: bigger tanks make it heavier to carry around.

The Built-In Hose Clean and Maintenance

Cleanup is straightforward. Emptying is easy — you lift the dirty tank straight up, no fussing with the handle position, and you can scrub it out with a brush. At the end of a job you slide the handle collar down to the hose-clean position and it flushes solution through the hose so nothing dries gunky inside — and because it's built into the handle, there's no separate tool to lose. Just don't leave dirty water sitting in it or it'll start to smell, like any spot cleaner.

Size, Weight, and the Lid That Doesn't Lock

It's on the heavier side — those bigger tanks add up — so it's more to lug around than a grab-and-go mini. And one real quirk to know: the dirty-tank lid doesn't lock. If the unit tips over, it can spill, so you carry it level and set it down gently. It's not a dealbreaker, but it's the kind of thing you want to know before you're hauling it out to the driveway to detail the car.

What I'd Change About the Bissell Little Green Pet Pro 3909

• The dirty-tank lid should lock — an unlocked lid on a machine you carry full of dirty water risks spills
• It's the older design in the line; newer models with separate solution systems (like SmartMix on the Little Green Max) are where the line has moved, though it still cleans just as well

Pet Pro vs the Little Green Max (SmartMix)

Quick lay of the land. The Little Green Mini is the light, cheap, grab-and-go pick for the occasional spill. The Pet Pro (this one) is the big-tank workhorse — heavier, but you clean more per fill, so it's built for car detailing and back-to-back messes. Above it, the newer Little Green Max (38572, SmartMix) is my current pick in the line: it adds a smarter solution system and a plain-water rinse. So the Pet Pro still makes sense if you specifically want the big tanks at this price, but if you're choosing fresh today, look hard at the Max.

Is It Worth It?

If you clean a lot at once, yes — the bigger tanks mean fewer trips to the sink and it cleans excellently, which is why it earned the Just A Dad Approved sticker. But be honest with yourself about how you'll use it: it's heavier, corded, the "Pet Pro" name oversells the pet features, and the dirty-tank lid doesn't lock. For just the occasional spot, a lighter mini is easier to live with, and if you want the newest design in this line, the Little Green Max with SmartMix is the one I'd grab now.