His tail is shorter than beavers. And i know it's not a giant rat.

Woodchuck (Marmota monax) ?
Maybe looks a bit small, but perhaps a juvenile.
also known as a "groundhog" amongst other things.
After he ate, he sat on the ladder yawning and stretching
I dunno. It could be a groundhog like Punxsutawney Phil. You can buy a small trap at Home Depot or Lowes. One or both of those stores will have it.
http://www.bing.com/images/search?q=grou...
http://www.bing.com/images/search?q=grou...
http://en.wikipedia.org/wiki/Groundhog
He is eating my neighbor's garden. I live in this city, close to New York, and lots of rivers around.
His tail is shorter than beavers. And i know it's not a giant rat.