How much for this doggie in the window? This is the K-9 robot pooch from Wild West Exodus.
He can be used with either the Lawmen or Outlaws, along with the Copelie Sisters.
They are much nastier when combined with the Sisters, as they get the Sic 'em ability. This was pretty important, as this little doggie went to work on Edison and munched him... in one turn!