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what are the symptoms of hip dysplacia and how would you go about having it diagnosed?
Here is a link to a general overview of hip dysplasia, symptoms and treatment.
www.peteducation.com/article.cfm
classetter - It does not sound like hip dysplasia, but for him to sit down like you describe is certainly not normal. If it was a one time only occurrence, I might blow it off, but if it has occurred more than once, I would definitely take him to get it checked out.
As far as flexibility, my girl, Halo (4 YO), is very flexible. When she gets off the bed she slides off and puts her front feet on the floor. She then walks forward with her back legs extended straight out on the bed until she pulls her back legs off. This is one of the ways she stretches those back legs. She also lays out on the floor with her front legs extended in front of her and the back legs extended all the way out behind her.