Oh, boy! You have 2 at opposite ends of the spectrum, don't you? Roxy is anxious and easily frightened (as evidenced by the pennies in the can experiment) and TJ is highly intelligent and, possibly, over-confident. {Sometimes dogs who act aggressive are actually fearful. The number one cause of dog bites is fear, not "dominance"].
If you want to do MORE reading, you might read some of Turid Rugaas. She's written some books about dog body language and "calming signals". One thing you could try when approaching Roxy is to not tower over her. Turn sideways, avoid direct eye contact and "make yourself smaller". Crouch down to pick her up instead of leaning over her - it's less threatening.
I hope you're taking a FUN vacation!
__________________  FirstYorkie
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