[Sphirex]

i have two gogs, a yorki(sphirex) and a swiss mountain dog mix(papae) they get along fine when im watching but once i leave the room i hear running then somtimes a few barks. once i come back into the room i see sphirex cornerd into a wall and somtimes paepe claws sphirex(well she basicly smacks her with her paw which is very big and she has sharp nails) papae is not aggressive at all but when sphirex even touches somthing that is hers she gets so mad! i know for a fact that when sphirex runs into paepas pikachu plushie its not on accident. i dont want to have to separate them all the time but i dont want sphirex to get squished! sphirex doesnt follow me around(which im very upset about) and she likes to leave the room just to bother paepe. any ideas as to how i can fix this? or have my yorki adore me so much that she would follow me around? thanks :]