VERY long. It's kinda like a big lhasa apso.
Longhaired.
Silky Terriers are longhaired.
Abyssinians are shorthaired. The longhaired variety is called the Somali and is often classified as a separate breed.
All Kooikerhondjes should have moderately long fur.
All Field Spaniels should have moderately long fur.
Balinese cats are longhaired. They are actually longhaired versions of the Siamese which have gone through a genetic mutation, and are recognized and classified as a separate by many reputable cat registries such as the CFA and TICA.
Bloodhounds have very very short fur which help them hunt in thick underbrush.
There are 3 breeds of Tibetan dogs: The Tibetan Spaniel, Tibetan Terrier, and Tibetan Mastiff.
All Welsh Springer Spaniels should naturally have moderately long fur.
Yes, Border Collies come in both shorthaired and longhaired variety, although the shorthaired variety is usually referred to "smooth" instead. Both varieties are accepted by reputable kennel clubs such as the Kennel Club and the American Kennel Club.
Tibet
See the link below, which is for the website of the Tibetan Terrier Club of Ireland. You may get more information by contacting them.