We went on just a two night vacation a few weeks ago. Our then 7 month old pup was a terror when we got home. We had a very qualified pet sitter, but he seemed to have lost all of his manners within a two day period. It only took a day or two to remind him who is boss and how he should behave.
I don't think Penny resents you, I just think she needs some reminding about her place in your pack.
I'm sorry about your grandma and pneumonia. No fun.
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