What breed was Ruffian?

I can't understand your question, if you breed to dogs of a different breed you will get a stray dog

They are all the same species so they all require identical treatment and conditions to breed successfully.

course not! you can have different breeds! but if you want to have a puppy they must be the same breed but not the same color..

Its possible you could, with alot of hard work over many generations, but any pups born would suffer from many problems, caused by the clashing of genes and DNA.

Yes, you can cross breed chickens and most of the time, we can't stop ours from cross breeding anyway as they all run around as a flock. The results mean they will not sell for very much but some can...