Your little dog can be carried in your purse or in your arms. He snuggles on your lap because he’s the perfect size lap dog. Bathing him can be pretty simple because of his size. His baths still take some time, but he can fit inside a large bowl or bin or even in your sink. He's not going to need to be washed very often, but he will need to be cleaned every now and then, especially when he's become extremely dirty.
Some little guys hate baths, and some don't mind them at all. Little dogs may use their immense energy to get dirty and may not want to slow down long enough to bathe, so yours may be reluctant to get in the water.