You can wash your large dog outside using a hose and dog shampoo. Utilize the sun to keep him warm while washing, brushing, and for drying.
Prepare a space to wash your large dog outside before you bring him out to get clean. You want to have a hose long enough to reach the area where you will be washing your big guy and be prepared with your dog shampoo and a towel as well. If you big dog won’t stay still, you may need to tether him to a tree or post.
Use the hose to soak down your large dog. Be sure to get his fur wet all the way down to the skin. Run the hose along his stomach and legs to ensure those are wet as well. If your large dog has an undercoat, it may take a little more water and time to soak all the way through to his skin.
Use your dog shampoo to scrub down your pup. You can pour shampoo directly onto his back and spread it throughout the fur, or you can pour it directly into your hands to distribute it all over your dog's body. Use your fingers to massage the shampoo onto his skin through his coat.
Once you are done scrubbing your dog's entire body, including his tummy, legs, tail, and potty area, use the hose to rinse him well. You can put a hose nozzle on the shower option, or you can hold the hose close to his skin for better control and rinsing. Be sure to remove all of the shampoo from your dog's fur and skin. Leaving any shampoo on your dog can cause excessive dryness.
Once you're done rinsing, step back as your big guy will probably do the wet dog shake. This will remove a lot of the excess water from his fur, so step back and let him do it.
Use a big fluffy towel or a few towels to dry your big guy. Once he's dry, you should probably take a brush to work out any tangles or knots.
The sun can also help you dry your large dog. Let him stay outside while you’re brushing him in the sun so he can be warm and the sun can work its magic and get him nice and dry. While you’re brushing, reward him for a job well done with some tasty treats.