The most obvious difference between a Himalayan and a Siamese cat is in their hair length as a Himalayan has a long, fluffy coat and a Siamese is a short-haired cat. Himalayan cats share blue eye color and point coloration with Siamese cats since the Himalayan cat was produced by crossing the Siamese with the Persian. These two cat breeds have very different personalities, however.
Himalayan cats are laid-back, mellow cats that enjoy being groomed. Himalayans are fairly social creatures. Siamese cats tend to be more active and want to be involved in everything that is happening. They are also extremely vocal cats and meow much more than Himalayans. Both Himalayan cats and Siamese cats come in a variety of colors.
Himalayans share some personality characteristics with the Siamese as both breeds enjoy playing fetch with a cat toy or a bit of crumpled paper. A Himalayan cat requires far more grooming than a Siamese cat due to the length of its hair. Himalayans enjoy this, and it is helpful for Himalayan owners to make grooming a daily activity to prevent their cats from looking unkempt and developing mats. Mats can cause infection when they eventually grow into the skin if left untreated.