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I am looking at adding to my current mischief I was talking to a breeder who bred a hairless to a normal I was looking at the pictures (they are still rather young) and was trying to tell if they could have rex fur? I don't know much on rat genetics since I only have them as pets but is it possible for them to be rex or is it just because they are so young and was a picture?
 

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Hairless was probably double Rex. It is easy to tell if they are Rex or not. Do they have curly whiskers? Curly = Rex. But the breeder should know what they are and tell u for sure.
 

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One of my new boys has wavy hair and whiskers. The breeder called it a "bristle coat", not rex. It's really interesting looking. It's like he's got permenant bed head.
 

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Often breeders will come up with terms to describe differences in what is probably the same gene, bristle coat is one of those, its usually found where a rex has coarser more wirey coat and as of yet I've not seen much evidence that its a separate gene.

As moonkissed said, the whiskers should give you an idea, you can judge from very young wether there a rex or not. The breeder should know if they know what there doing.
 

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I would describe it more as different "degrees" of rex fur!
Velveteen- wavy and soft. After the second moult they may even look standard for a while and then become more wavy over time.
Rex- curls, thick wavy-curly coat
Bristle- more interspersed and coarse rex
Double rex- close to hairless. Hairless with bristle-like patches.

As said before, depending on the babies history the breeder will be able to tell you what "degree" of rex your rattie is!
 

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I've had three rexes that had very different hair... Check out the whiskers, if they are curly it's a rex. And yes, one of the rexes we had started out with very wavy fur that turned completely straight by the age of 5 weeks old, but her whiskers stayed curly...

Velvety Rex

Marsupial Rat Ferret Muridae Grass


Bristle coat rex

Rat Vertebrate Mammal Muridae Rodent
 
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