TOP FILL DESIGN, NO HEAVY LIFTING EVER: Unlike every other large dog water dispenser that forces you to pick up a heavy jug and flip it upside down, the Critter Cooler fills from the top with a hose or tap. No back strain, no spills, no frustration. Perfect for senior pet owners, anyone with a bad back, or anyone tired of the daily jug wrestling match. Available in 3.5, 5.0, and 6.5 gallon sizes. ROLLS ANYWHERE ON 3-INCH LOCKING WHEELS: Fill it at the kitchen sink, then roll your full automatic dog waterer straight out to the patio, backyard, or dog run. Even our 6.5-gallon model at 55 lbs rolls smoothly on three locking casters. Lock it in place so it stays put all day. Roll it back inside at night. No other large gravity-fed dog water dispenser does this. 3.5 TO 6.5 GALLONS MEANS DAYS BETWEEN REFILLS: One or two dogs? The 3.5-gallon gravity dog water bowl lasts 3 to 4 days. Three or four large dogs? The 6.5-gallon self filling dog water bowl keeps a dog daycare running all week. Drain plug lets you refresh just the bowl without emptying the reservoir. More gallon capacity, fewer daily chores, cleaner water for your dogs. GRAVITY-FED, NO ELECTRICITY, NO FILTERS, NO NOISE: The Critter Cooler is a true gravity water dispenser for dogs. No power cord to trip over. No pump to burn out. No carbon filters to replace every month. No humming motor to spook your dog. Just gravity keeping the bowl full and your pets hydrated. Works indoors, outdoors, in garages, on patios, and anywhere without an outlet. BPA-free, food-grade plastic. USED BY DOG DAYCARES AND HUMANE SOCIETIES, MADE IN THE USA: Critter Coolers run at dog daycares and rescue shelters serving 1,000 dogs at each event. Virtually indestructible. If a determined chewer ever wins, we sell every replacement part. Proudly made in the USA for over a decade. This autofill dog water bowl for large breeds may genuinely be the last one you ever buy. Most large dog water dispensers make you do the same frustrating thing: pick up a heavy jug, flip it upside down, aim for a tiny hole, and hope you do not spill. At 5 gallons that is a 40-pound lift. At 6.5 gallons it is 55 pounds. Do that once a day, twice a day, and it adds up fast on your back. The Critter Cooler fixes that with one simple idea: fill from the top. Open the lid, run a hose in or use a pitcher, fill it up. No lifting, no inverting, no mess. Then roll it wherever you need it on the 3-inch locking wheels. Kitchen to patio. Laundry room to backyard. Bedroom to hallway. Lock the wheels and it stays exactly where you put it. Gravity does all the work from there. As your dogs drink from the bowl at the base, gravity pulls fresh water down from the reservoir above. No electricity. No pump. No motor noise that spooks nervous dogs. No carbon filters to replace every month. No cords to trip over. Just clean, quiet, continuous water for your dogs, cats, rabbits, or whatever animals share your home. Available in three sizes: 3.5 gallons for one or two dogs, 5.0 gallons for multi-dog households or large breeds, and 6.5 gallons for dog daycares, working farms, or serious multi-pet homes. Pair any size with the optional Chiller Cover to keep water cool in 115-degree summer heat. Every part is BPA-free, food-grade, and made in the USA. Critter Concepts has supplied water to 1,000 dogs at a time at Humane Society fundraising events in San Diego and Pasadena for over a decade. When something breaks, you buy a part, not a whole new unit. That is why we say this may be the last dog water dispenser you ever buy.