My name is Marble!

She gets along with a male Chihuahua and with my 3 cats. She has never hurt a soul. She is great with my 9 year old son but she doesn't understand how big she is and can knock young children down, she tends to jump but I am sure with training the jumping will stop. She is high energy and needs a lot of exercise, something I have a hard time giving to her.
She needs a home with a large backyard, something I can't provide. She uses a doggy door that I have in my sliding glass door. Never has had an accident in the house. She is 5 years old and we found her initially on the side of the highway and couldn't leave her there.