I have a little Jack Russell called Ellie. She's 9 years old and loves helping ponies eat their dinner
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Here she is with her favourite one of my hamsters. (and no I wouldn't leave them alone together, she is an excellent mouser, but seems to know the difference quite well!)
I have a Boston Terrier. She's very mellow and acts like a big dog, except when a. a chipmunk appears b. you show her a tennis ball or stuffed toy or c. she meets a boy dog with his tackle
My Stella is not afraid of the big dogs, but she is terrified of chihuauas. At the small dog playdate we attend on Saturdays, a 3lb chihuahua keeps all the French Bulldogs and terriers in line.