I think I can answer this question myself given that my previous black lab never had a bath in 12 years but I got some very funny looks if I ever mentioned this. He used to swim in the river/lake/sea fairly regularly and would be towelled dry afterwards. His bedding was kept clean and his collar washed frequently. He didn’t smell doggy until near the end when his breath got bad! Now I have another lab who gets the same treatment and given how strong quick and wriggly he is I think I would struggle to bath/hose him down. He doesn’t roll and I’m guessing that like human hair a dog’s coat is self cleaning after a while. Any thoughts?