Solution? The booster dog bath tub!
Here's Myko modeling he and Max's new fashion forward, Jetsons-inspired, bathing apparatus.
It elevates them to standing height. Easy to move around them. Has three point leash attachment to keep them secure. A drain with hose so you can direct the run off. Even padded non skid floor and a shampoo holder!
My RV, like most, has an external hot and cold water faucet with hose and sprayer. So I can bath them outside or if weather is bad I think this would even fit inside my shower.
Legs detach and store inside and it fits easily in my RV storage compartment.