1. Did it?
1. Anecdote is not evidence.
1. Dog could well have picked up cues from you.
1. You may have had your perceptions altered due to placebo on you.
1. *Something* might have changed/worked which had nothing to do with the acupuncture.
There is no evidence to support acupuncture, there is no known mechanism for it to work, it's bullshit.