[Shasha]

Hi all, need some advice please. I have a 3 year old Yorkie girl (Marnie) who i bred and is the 'Top Dog' in a clan of 3 girls and 1 dog. I recently was given a yorkie girl aged 18 months called Maisey. At first all was fine, Maisey came into season after been with me only 1 week, mated with my stud dog,and im expecting a litter end of June.
Suddenly, Maisey and Marnie have had a go at each other. I give each the same attention, but ive noticed that Maisey is 'Squaring Up' (Challenging) Marnie - and they both had another go at each other a few days ago and again todday. It really is begining to worry me, as the other dogs all get along
just fine - any ideas what it could be?? PLEASE PLEASE HELP. THANKS