Winter and smudge do the same thing at times so I kind of know where you're coming from. I can be playing with Smudge or giving Winter a good petting (Winter can't stand being played with like how I play Smudge, she's got to much pray drive) and the other will come and start to butt in. When I first got Winter she actually did the same thing as Zeke she would go after his legs and ears for no reason what so ever and then Smudge would get a little snippity with her. Things have setteled down now at least for the moment. Smudge will occasionaly give her a little growl now and then but she usually deserves it.

Maybe Zeke and Josie just need some time to sort things out, after all Zeke's younger then her and just about the same size so maybe they're having a power stuggle or something like that. And maybe the thing with Josie and the collie was a misunderstanding with her in regards to the collies body languge or she was trying to protect you.

Don't worry though hopefully things will work out between them.