The most difficult cat to own would be either a Bengal cat or a Sphynx cat. Bengal cats are actually a mix between domestic and wild cats. Because of this, they can have really high energy and be very mischievous. However, they're also very adventurous and some owners can take them on walks or hikes. Sphynx cats are very friendly and affectionate, but very high maintenance. Because they don't have hair they can get sunburned easily. Natural oils can build up on their skin and leave stains on furniture. Sphynx cats are the only cat breed that must be bathed regularly.