Guinea pigs can be given baths, but it's generally not necessary to do so unless they have become particularly dirty or smelly. It's important to note that guinea pigs have delicate skin and are prone to developing dry skin or fungal infections if they are bathed too frequently or if the water is too hot or too cold.

If you do decide to give your guinea pig a bath, it's important to use a shampoo specifically designed for small animals and to make sure that the water is lukewarm (not hot or cold). You should also avoid getting water in your guinea pig's ears or eyes, and be sure to dry your guinea pig thoroughly with a towel after the bath.

Overall, it's best to only give your guinea pig a bath when absolutely necessary and to stick to spot cleaning and grooming as much as possible to keep them clean and healthy.