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German shepherds are intelligent easy to train and friendly toward humans, dogs, cats and other animals if you raise them up properly.

I have a GSD with a spaniel and a parrot and he is extremely friendly. The spaniel and him are best buds.

Which ever breed suits you the best. I have a Doberman and a 13 lb. Poodle mix. Wanna take a guess at who rules the roost? That's right, the little mutt. Which ever breed you decide on, it's always best to get the opposite sex of what you already have. I'm not that familiar with Rotts and Shepherds, but Dobes can be same sex aggressive, especially males.

Rottweiler they are gentle giants and great family dogs. Ive always had mine around cats, small children & other animals. Dobermans and Sheperds tend to be a bit more high energy. Either way with proper training and lots of exercise Im sure you'll be fine with whatever you choose.

this is a hard one because i have a german shepherd, a pupppy doberman pischer,and a chihuahua my german shepherd is al ot of fun and he actually protects my chihuahua and puppy!

german Shepherd!

They can all be trained to tolerate your current dog. I'm partial to Germans, so I say get a GSD.

A Boxer!!!

Papaw