[HOLLYSKAT]

I've seen a lot of puppy aggression training and territorial issues discussed here but that's not what I need. I spent the early part of my yorkie's life establishing the alpha role, setting boundaries, and teaching simple commands. It went well. She is paper trained with a 99% success rate in my home and around 80% in other places. However .... I feel like the parent of a human teenager because around age five her training started slipping away. She comes when called only sometimes etc. and is more willful in general. She also is way more likely to make potty mistakes in other people's homes. But now she doesn't want to go outside. Has displayed four acts of aggression in two years (ankle biting a friend who she adores when she moved from one room to another, snapped at a child's finger when he entered my bedroom, nipped a toddler who was irritating her, and snapped at and growled but didn't bite someone who reached to pet her in my purse) I'm devastated as she was socialized with humans to the hilt as a baby. She was the mayor of my last apartment complex and has always loved meeting strangers. The behavior is territorial in nature -- except the irritating toddler that was super instigated I don't count that one. She retreats when I have people over when she used to be the life of the party. I don't understand the change in behavior as she's aged. She's becoming bitter and it kills me. She never was. Now-- I don't know what to do about her anxiety and behavior. She's in my opinion not a good candidate for a trainer. Since she is fine most of the time. Agreeable and will even let you hold her on her back. Then she snaps. It's getting worse. How do I fix it now and why is this happening at this stage in the game ?