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I gave my terrier a bath in the kitchen sink at first, then the bathtub, and by the third time the bathroom looked like a small flood had been weaponised, I admitted I was doing it wrong. Bathing a dog at home is not hard, but it is a craft, and the floor is the first casualty of a beginner.
The setup decides everything. I moved it to the shower, not the tub, because a hand-held head beats a cup of poured water and a non-slip mat beats a dog sliding into the porcelain. A dog that slips panics, and a panicking dog floods the room, so the mat goes down first and the dog goes in second, and I learned to close the door before the water, because a wet dog with an exit is a wet dog in the hallway. Cotton balls in the ears keep water out of the canal, which is where the shaking-headed infections start, and a dab of ointment on the eyes blocks the sting of the shampoo.
The water temperature is the part people get wrong by guessing. Too hot and you scald a thin-skinned dog; too cold and you have a shivering, struggling one. I aim for lukewarm, the wrist-test, and I wet him from the neck back, never the head first, because a dog with a wet face is a dog that shakes, and the shake is where the flood begins. The shampoo goes on a wet coat, worked into a lather with the flat of the hand, not the nails, and the rinse is longer than the wash, because leftover soap is the itchiest thing a dog will ever wear.
The breed decides the schedule, not the calendar. A greasy retriever or a spaniel with a dense coat needs a bath every few weeks; a short-coated whippet barely needs one and gets skin trouble if you overdo it. I wash mine when he smells like a bog or rolls in something unspeakable, which is often enough, and I use a dog shampoo, never the human stuff that strips the oils and leaves him flaky. A conditioner on the long bits keeps the coat from tangling into knots that need scissors.
The towel is where most owners stop, and the shake is where most bathrooms get redecorated. I taught mine to tolerate a low dryer on warm, not hot, held at a distance, because a dog that fears the dryer is a dog you will never finish, and the warm air that reaches the skin is what prevents the musty smell a damp coat develops by the next morning. For the double-coated breeds the undercoat holds water like a sponge, and a thorough dry is the difference between a clean dog and a sour one by Thursday.
The reward at the end is not optional, it is the deal. A dog that gets a treat and praise for surviving the ordeal decides the bath is tolerable, and a dog that gets a struggle decides it is a fight to win next time. I keep the whole thing short, ten minutes, end on a win, and the terrier that once fled at the sight of the shampoo bottle now hops in when the mat comes out, which is either training or Stockholm syndrome, and I am not asking which.
Bathing at home saved me the groomer's bill and the car full of wet dog, and once the flooding stopped it became a non-event. Close the door, mat the floor, lukewarm the water, cotton the ears, rinse the soap, dry the undercoat, treat the end. Do those and the bathroom stays dry, the dog stays clean, and the only thing left wet is the towel, which is exactly where it should be.
The puppy is the easy case and the adult is the real test. A dog that has never been bathed will read the water as an attack and fight with a strength that surprises you, and the fight is what floods the room, so the early, calm, treat-heavy baths matter more than people admit. I started mine as a puppy with a damp cloth and a reward, so the tub never became a surprise, and the adult dog that resulted tolerates the real thing because the real thing was just a louder version of what he already knew. The owner who waits until the dog is filthy and then wrestles him learns the hard way that the struggle is the bath.
There is also the question of how often, and the answer is boring: when he needs it. A dog that rolls in the unspeakable needs it now; a dog that smells of healthy dog does not, and over-bathing a short coat strips the oils and leaves him itchy and you with a problem you made. I learned the schedule from the nose, not the calendar, and the bathroom stayed dry, the dog stayed clean, and the only wet thing at the end was the towel, exactly where it should be.