Signs of this life threatening problem includes retching, drooling and pawing at the mouth.
Contact your vet immediately if an object is stuck in your pets throat. Only attempt to remove it if you can safely restrain your pet and fully open its mouth.
Grab the object and pull it out gently. If it does not come out easily, leave it alone.
Do not pull out any part swallowed string or thread as this might concertina the intestines.