Like humans, our furry friends need occasional cleaning, which we call grooming. Grooming involves a series of hygiene and maintenance tasks, such as combing, brushing, clipping, bathing (if necessary), cleaning eyes and ears, and trimming claws.
Certain breeds of pet with long hair require daily combing/brushing to avoid skin problems. In fact, I've personally chosen not to have pets with long, dense hair because I don't have the time to groom them, nor the financial means to send them to the groomer periodically.
Otherwise, full grooming can be done every three months with appropriate products like those from Zanimo. Claw trimming can be done every four weeks. Here's some information to help you complete the grooming cycle.