I had a Jack Russell “Terrorist”, too! I’ve often said that if JRs were a large dog breed, they would rule the world. Megs kept me on my toes .... lots of fun. She was a rough-coat .... looked like someone had plugged her into an electrical socket and she could definitely act that way, too. I had horses so she had lots to keep her busy - quite the mouser ... I took her through a couple of levels of obedience training (several folks told me that JRs couldn’t be obedience trained - ha!) and she was one of if not the best working dog in the class ... smart as a whip and she loved to “work”. We had a few arguments over who was ‘pack leader’ once in a while, but not often .... she growled at me as a puppy and all hell broke loose (for her) so usually all I had to do was say her name in a sharp tone & stare at her and she’d back down. She died in her sleep at 13 .... sure do miss her lively, happy spirit around here.