Causes
Pieces of food that are too large, bones, small toys, balls. Breeds that eat very fast or play with small objects are at greater risk.
Diagnosis
The situation is obvious. There is no time for tests.
Treatment
EMERGENCY: if the animal is still breathing at all, go to the vet NOW. If it is collapsing, you can try to remove the object if it is visible (without pushing it in further) or perform airway-clearing manoeuvres. Afterwards, ALWAYS seek veterinary care.
Prevention
Cut food into pieces, avoid toys and balls that are too small for the animal's size, supervise play, use slow-feeder bowls if it eats very fast.

