Should I call someone about my neighbors dog that has some kind of skin infection?

They even have her in a dog pin. Poor bby she is a beautiful german shephard and she has no hair. They don't pay attention to her. I feel so bad when i see her I wish I cld just go over and bathe her or take her to the vet. I don't know what to do cuz I'm her NEXT door neighbor and she's gonna know I called someone. What can I do??? plz help!!!!