OMG - she is ADORABLE! A veritable fuzz muffin!
I don't have experience w/ tethering. Since she's only 5 mths old, she may not be putting it all together yet. I'd suggest a great book by a trainer named Tamar Gellar, the book is The Loved Dog. She is Oprah's trainer and she believes *only* in positive training and teaches you about how dogs communicate w/ us. She's incredibly gentle and knowledgable. LOVE her.