Sweep away any debris from the snag using a small brush. Squirt a small amount of aqueous glue into the edge of the snag.
Poke the thread back into the place. Hold it there with a flat-head screwdriver or awl. Squirt another dollop of liquid glue into the carpet snag. Press the next part of the thread into the snag and hold into place with the tool.
Continue to work with the glue and the tool until the snag is in place. Allow the glue to cure for six or more hours before walking on or cleaning the carpet.
Cut away large snags using sharp scissors. Observe the spot you trimmed. Replace the large bare areas with a piece of new carpet.
Trim up the new piece of carpet with sharp scissors. Dab the back of the carpet piece with carpet adhesive. Avoid getting the glue on your skin.
Position the new piece over the torn area, glue side down. Roll over the repaired area using a rolling pin. Dab up any excess glue using a damp cloth.
Allow the carpet to dry six or more hours before vacuuming or walking on it.