Assassin bug nymph
5843 Mainly green body with red striation along back. Someone suggested it was an assassin bug. May have come in with the dog.
This is indeed an assassin bug (Hemiptera/Heteroptera: Reduviidae; it is a nymph in the genus Zelus, likely Zelus luridus – see http://tinyurl.com/j7822h4 for more detailed information. Ed Saugstad, retired entomologist; Sinks Grove, WV.