[Snow]

Hi again - thanks for your advice. While waiting for phone calls back from the dog trainer that was recommended by a few nice folks on this site i've been trying to work with her more and getting her out more, for shorter walks with no allowance for marking - without my little pug.
After waiting a few weeks and numerous phone calls to the recommended trainer, I tried another school who called me back right away =)
She is coming for a home visit on Sunday to assess Isis, and she has given me a few tips in the meantime which relieved me greatly. I hope to get her into classes soon after, as well as my wee pug.
Hope all goes well and I will keep working with my girl, hope to soon break this budding aggression! Eventually I'd like to get her into agility training - after some good obedience!

Thanks again for your help, as a newbie Rottie owner and dog owner I need all the help I can get so will be keeping up with the advice from this site!