What kind of dog do I have??

Question
Hi,
  About 3 days ago I got a dog from the Humane Society. I was told she was a 2 year old terrier mix.They were not sure what kind of terrier though. I was wondering if you could help me and possibly tell me what kind of dog she is. She is very lovable and loves to play at the beach. Since I have had her she has not barked at all even when other dogs do. Right now she is very skinny due to the fact she was mistreated at her former home. I was also wondering what the best kind of food is to feed her to make her healthy and gain a little weight. Here are a few pictures of her.

http://s295.photobucket.com/albums/mm138/manda_mack/

Answer
Hi,
Nice pictures.  Have you ever seen the old black and white movies "Our Gang Comedy"?   Your dog is similar looking to "Petey" which is the dog in that movie.  He is an American Bulldog.  I think your dog is part American Bulldog and maybe some Australian cattle dog.  might even be a bit of terrier in there.
nancy