Designer Dog Blogs

hello their ive just found out my dog is not the breed i thought it was. I was under the inpresion my dog was a daniff i.e a graet dane crossed english mastiff which the seller said it was. she looks like a graet dane but not mastiff then tonight i started looking on the internet and found out what she is. To my supprise belle is a graet dane crossed german shephard i am not really bothered by it its just annoying that the people who sold me the dog were lieing about what breed they were  selling. My puppy is an amazing dog she is so soft with my children actually she thinks she is one of them well she is. I was wondering if anybody on here has any advice on the eating habbits of such breeds or need any advice.