Bailey is 7.9lbs (yorkie) and leah is HUGE lol dunno how much she weighs but she is a big lab. Bailey often ''beats'' leah up. Leah is sooo careful with bailey but sometimes i have to tell them off if they are getting over excited. i never leave them in the same room together if we are out the house and i make sure me or my partner are there if they wanna have a play. If the Dobie growls at the yorkie i would defo make sure u nip that in the bud right away and NEVER leave them alone together. Good luck and congrats on your 2 furbabies