1) Am I overreacting? it seems like a breach of trust to me.
Personally I think you are overreacting, it doesn't seem like a big deal to me. She's not your W anymore, but your paths are going to keep crossing in unexpected ways. Try not to see a conspiracy every time it happens!
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2) Do I say anything to my friend? (I feel like I need to)
Nah, I would let it go.
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3) Do I say anything to EW (my instinct is to ignore)
Here's the thing, you didn't tell W where the dog was going to be, you didn't tell her when you would be back, so she took matters into her own hands. Do you think you have a right to be mad at her for it? Does she not have just as much a right to be mad at you for not telling her anything? It's no big deal, let's talk about Davide's awesome life without W instead