My dog has been sucking on my blanket ?

I have a 1 and a half year old pit/lab mix and tonight I caught her on multiple occasions tonight sucking on my blanket and moving her paws in a soft and slow motion like cats do, which is sometimes called "kneading dough". Tonight is the first night I have ever seen her do this and she looks so clam and... show more I have a 1 and a half year old pit/lab mix and tonight I caught her on multiple occasions tonight sucking on my blanket and moving her paws in a soft and slow motion like cats do, which is sometimes called "kneading dough". Tonight is the first night I have ever seen her do this and she looks so clam and sleepy while doing it. She does it for 1 to 2 minutes straight and so far I've caught her doing it 4 times within the past 2 hours. Why would a behavior as such come on like that and why is she doing it?
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