Can a dog and cat get along?
German shepherd and Somali cat for instance?
Yes they can and do. It does not matter if they have grownup together or not. They find their own hierarchy amongst themselves. I have three cats and two dogs (one is a GSD as well). They all get along just fine.
Yes, of course it happens all the time
sure, just like people! but they generally choose not to!!!...;-)
if they grew up around them. Had a sheltie and a Siamese cat.
Yep. My pitbull and beagle are actually the ones who get bullied.