Colton Underwood's been united with his furry new roomie, Thor ... and the good boy's already making himself at home.
TMZ got video of the 2-year-old German Shepherd inside the 'Bachelorette' star's house Saturday ... hesitantly learning to go down the steps and meeting his new canine bro, Sniper.
The "goofball" also got to feast on some people food -- delicious rotisserie chicken.
We broke the story ... Thor was destined for the meat markets of Asia before the non-profit org Bunny's Buddies saved him, and Colton got involved to make it a happy ending for all.
Straight off the plane into my arms 🐾❤️ pic.twitter.com/UGM5Xh24fE