Dog question

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I grew up with dogs.. never actually owned one of my own... I’m about to get a German shepherd puppy.. and I have a cat at home. My cat is my baby.. and I’m nervous for him.. I know they say German shepherds can be aggressive towards cats because they have a high prey level... but they say if it’s a puppy, all you have to do is train well.. any ladies on here own or have owned a German shepherd? I Would love your input and experience with the breed.