The catch
BISSELL Little Green Pet Pro
Solution has to be mixed by hand.
Side by side
A larger clean tank and a documented five-foot hose point to Pet Pro 3909. Lighter carrying for smaller spills and upholstery jobs points to Little Green 1400B.
Before you buy
Clean-liquid capacity is 0.5 US gallon for Little Green Pet Pro and 0.38 for Little Green. The gap between them is 16 fluid ounces, before recovery-tank limits come into play.
Where this comes from
128 US fluid ounces =1 US gallon. The capacities on record are 64 and 48 fl oz. Converting puts tank volume on one scale and says nothing about cleaning coverage.
The catch
Solution has to be mixed by hand.
The catch
With such a short attachment hose, you end up repositioning the body around a sofa or vehicle.


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Pet Pro 3909 brings a larger clean tank and a documented five-foot hose. Little Green 1400B is better for lighter carrying on smaller spills and upholstery jobs.
Pet Pro is the portable with more capacity
Which one fits
Compared with the 1400B, its 64-ounce clean tank adds 16 ounces. The exact 3909 page documents a five-foot hose, and the selected package includes pet-focused tools.
At 9.65 pounds, the 1400B is lighter than the 3909 at 11. A lower carrying weight can count for more than tank size when the cleaner regularly changes floors.
BISSELL's documentation for the 1400B conflicts, with hose lengths between four and 4.5 feet. The five-foot figure for Pet Pro is clear, but the exact difference should stay a range until someone checks the carton.
The 64-ounce tank is 33% bigger than the 48-ounce tank on the 1400B, and empty weight goes from 9.65 to 11 pounds.
In practice
Clean-liquid capacity is 0.5 US gallon for Little Green Pet Pro and 0.38 for Little Green. The gap between them is 16 fluid ounces, before recovery-tank limits come into play.
128 US fluid ounces =1 US gallon. The capacities on record are 64 and 48 fl oz. Converting puts tank volume on one scale and says nothing about cleaning coverage.
Filling the clean tank puts roughly 4.17 pounds of water weight on Little Green Pet Pro and 3.13 pounds on Little Green. Follow the manual when you move and fill them.
Approximate water mass = clean capacity in US gallons ×8.34 lb/gal. Inputs 64/128 and 48/128 gallons. The real total shifts with formula concentration, leftover dirty water and tools.
The 64-ounce tank is 33% bigger than the 48-ounce tank on the 1400B, and empty weight goes from 9.65 to 11 pounds.
(64 / 48 - 1) × 100 = 33.3%. 11 - 9.65 = 1.35 lb. Knowing the clean capacity does not tell you how much area gets cleaned.

BISSELL, 3909
Pet hair, crevice and self-cleaning stain tools come with this portable, which has higher capacity.

BISSELL, 1400B
A well-known portable with a 48-ounce tank. You spray, scrub and extract directly on the spot.
Spec by spec
| Spec | BISSELL Little Green Pet Pro | BISSELL Little Green | In practice |
|---|---|---|---|
| Machine type | Portable spot cleaner | Portable spot cleaner | Using a spot cleaner in place of a whole-room upright is not efficient. |
| Nominal clean tank | 64 US fl oz | 48 US fl oz | Capacity does not promise area covered. |
| Empty weight | 11 lb | 9.65 lb | Weight goes up with water, tools and solution. |
| Hose | 5 ft | Maker page conflicts between 4 and 4.5 ft | Look at exactly what the bundle contains, and at any model documentation that disagrees. |
| Power cord | 15 ft | 15 ft | Usable reach depends on outlet position. |
| Cleaning system | Manual formula mixing, pet and crevice tools | Manual solution mixing and hose extraction | A feature list cannot name a winner without a matched cleaning test. |
Trade-offs
Decision guide
For a larger clean tank and a documented five-foot hose, choose Pet Pro 3909. For lighter carrying on smaller spills and upholstery jobs, choose Little Green 1400B.
Compared with the 1400B, its 64-ounce clean tank adds 16 ounces. The exact 3909 page documents a five-foot hose, and the selected package includes pet-focused tools.
At 9.65 pounds, the 1400B is lighter than the 3909 at 11. A lower carrying weight can count for more than tank size when the cleaner regularly changes floors.
BISSELL's documentation for the 1400B conflicts, with hose lengths between four and 4.5 feet. The five-foot figure for Pet Pro is clear, but the exact difference should stay a range until someone checks the carton.
By the numbers
What we found across the carpet cleaners we compare, plus the checked facts behind each finding.
This guide keeps all 22 models in play. The pick rests on the facts and trade-offs on this page.
22 models fit, out of 22 checkedHow we countedNo needs are preselected here. Open the matcher and add the ones that apply to your home, room or setup.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| BISSELL Little Green Pet Pro | None of these needs is a documented match |
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| BISSELL Little Green | None of these needs is a documented match |
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Ready to buy
Open either model on Amazon for the current price, customer reviews and delivery options.

Longer runs before you need to refill
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