Sheba has started doing this thing lately (maybe few months): she will come up to me, and start bumping her rear into my leg. Not under the tail part, but more like the lower back (where back meets the tail). Ultimately, she wants me to scratch it, and when I do, she is over the moon happy. If my leg is not available, she finds somehting else to throw herself against: couch, corner of the wall, our toddler...
While I am happy to scratch it for her when I can, I am curious what could be causing it. One version I have heard that it might be fleas, but she is on flea prevention. Her coat looks great, and she doesn't really scratch herself anywhere else. Suggestions? Remedies to try? She is currently on limited ingredient food: http://acana.com/products/duck-bartlett-pear (maybe there is somehting in the contents that is a known allergen?)
Thanks.

I thought maybe worms or fleas, but she is clear of both. Her coat is beautiful and doesn't scratch anywhere else. She makes some crazy faces and chatters when I scratch or just rub it.