Does my dog have mange???(view pictures)?

I got my lab mix 4 month old puppy from the pound 5 days ago. when my kids and i played with her before deciding to take her i noticed some bare spots on her hind legs. i told the kennel worker i was concerned about it and she assured me that it was not mange and that it was from her and the other puppy she was... show more I got my lab mix 4 month old puppy from the pound 5 days ago. when my kids and i played with her before deciding to take her i noticed some bare spots on her hind legs. i told the kennel worker i was concerned about it and she assured me that it was not mange and that it was from her and the other puppy she was with playing really rough...i took her word for it.......however since we have been home she has not stopped chewing and scratching her hind legs, she also crawls on the grass outside i guess as a way to scratch her stomach, i have noticed a couple small round scabby spots..here are some pics..

http://i79.photobucket.com/albums/j145/BabyLove3217882/Picture173.jpg

http://i79.photobucket.com/albums/j145/BabyLove3217882/Picture174.jpg

http://i79.photobucket.com/albums/j145/BabyLove3217882/Picture175.jpg

http://i79.photobucket.com/albums/j145/BabyLove3217882/Picture176.jpg

if not mange what??
is it contagious to cats?
is there any home treatments for it?
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