Samanthapuppy, I can't remember how old Samatha is . I do know I have two cats and two dogs and have very little problems. All four of them are female.( And Mandy isn't fixed because of a heart ailment.) They all are close in age though where I believe you've had Samantha for awhile. The main thing to me is you really have to work at it and a lot of close supervision is essential, especially at first. I never considered what type of breed my dogs had mixed in them I just went to the shelter and picked out the pup! Call it luck? Don't think so, I've had multiple dogs before with no problems. I have to pat myself on the back for it working out Good luck with whatever you decide to do and I'm sure many others can offer more advice. and btw, Chloe is cute!