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At this page you will find answers to questions of John, a Russian blue lover, published on a forum in 2005. Al this question are connected to genetics, the way genetic information is shown on pedigrees and the relation between Russian blue and Nebelung. His questions (shown in black) are like a FAQ.

Question of John: I'm not a expert on cat genetics, but I believe the short hair gene is dominant. So the only way to get a long hair Russian Blue is to cross breed with a non Russian.

As you say correctly the shorthair gene is dominant and the longhair isn’t. The consequence of dominant and recessive gene is that a cat can carry information in his genes without showing till he meets a partner with the same information in his/her gene’s. Then there is a likelihood of 25% that a kitten shows the information. In this case the kitten will have long hair, but it can be any recessive information, colour, eye-shape, hereditary disorders etc..

This matrix shows the odds of dominant and recessive genes. I used the name Russian Blue Variants as this could be the situation when it is unknown if longhair gene is present.

Kittens to be expected from Nebelung/ Russian Bleu variant/ Russian Blue matings

Parent 1

Parent 2 (one of the following)


Russian Blue

Russian Blue Variant


All Nebelung

All Russian Blue Variants

50% Nebelung
50% Russian Blue Variants

Russian Blue

All Russian Blue Variants

All Russian Blue

50% Russian Blue **
50% Russian Blue Variants**

Russian Blue Variant

50% Nebelung
50% Russian Blue Variants

50% Russian Blue**
50% Russian Blue Variants **

25% Nebelung
75% Russian Blue Variants *

*only 50% are true variants, the other 25% do not carry longhair, but it is impossible to tell visually which is which
**impossible to tell visually which carry longhair

So there is a likelihood a Nebelung is born from Russian blue parents. Especially because no breed is made by God and born “pure”. Like Siamese cats are always mentioned to be used to revive the Russian blue after WO 2. They too have longhaired sisters/brothers, Balinese. That could also be the source. Anyhow longhaired Russian blue kittens/ Nebelung kittens are born, once in a wile, in Russian Blue litters.

The Nebelung has also a fresh created side. Cora Cobb had the 2 first registered Nebelung born (1984) from a housecat and a look al like R.B. She liked them so much, she wanted to start a new breed. She was advised by the T.I.C.A to make the breeding standard as the R.B. but with one difference length of hair.

Using an other breed besides the Russian Blue for the Nebelung is not allowed. Using the Russian Blue is allowed (recommend) to create and protect a healthy genetic base of the Nebelung.

What about the shorthaired Nebelungs? Will they be listed as Russian Blue?

The U.S.A. the situation is different to the situation in the Netherlands. In the U.S.A. (T.I.C.A.) the Nebelung is a sole breed, so shorthaired kittens are revered to as shored haired Nebelung. In the Netherlands (Independent Societies) the Nebelung is a longhaired Russian Blue. Shorthaired kittens from a Nebelung are Russian- blue variants and these kittens are shown as Russian blue, but in their pedigree you will find that they are Russian blue variant and child of a Nebelung. (like the Somaly and the Balinese)
But either way the Nebelung  and the short hair variant are not allowed to be used in breeding Russian blue. In Russia different rules of pedigree registration are used. So at it happens more often that longhair kittens are born from Russian Russian Blue.

Addition in 2007 Pawpeds has a use full data base with Nebelung and Russian cats. Just take a look.

Dear John, I hope this information is useful.