Welcome to YT!! So glad to have you all here!! Is Sheba a Lilac Point Siamese? I was trying to tell what color she is. I have Siamese too - used to breed, but my male passed over a yr ago at 18 1/2 - my female will turn 16 on Monday. She is a Seal Point - but over time we thru seals, blues, and chocolates.
 
She's tolerant sometimes of my 2 adopted yorkies - they were over a yr old when they came into the house, so they thankfully weren't into chasing her down. Sometimes she loves to sleep with them for the heat 
  
You have beautiful yorkies!! You will have to sign Chowder up for our Little Gentleman's Club, you can do so on this thread: 
http://www.yorkietalk.com/forums/sho...ight=gentleman