20 Signs of bloat or torsion:

distended abdomen
rigid (hard) abdomen
painful when touched in the abdomen
vomiting foamy or liquid material
unproductive attempts at vomiting or retching
arched back
praying position (down in front, rear standing)
laying down on belly - crouched position
curling up in a ball
laying or sitting in an unusual location
seeking a hiding place
looking at their side
frequent swallowing (aerophagia)
hypersalivation (drooling heavily)
drinking excessively
lack of appetite
quiet, any abnormal behavior
lethargy, weakness
panting, breathing rapidly or heavily
red gums, or white gums (not normal pink color)

You know your own dog the best and you know when things aren't quite right.
If you notice any of these signs in your dog,
call your vet or take him to an emergency clinic as soon as possible.
Not all dogs show the classic signs of bloat or GDV (Gastric Dilitation Volvulus) some may be very subtle or be at a pre-bloat stage.
Keep a copy of this list, your vets phone number,
an emergency clinic phone number,
and your pet's medical history in a convenient place in case of an emergency.
Bloat and GDV occur very quickly, and a dog can be in shock within minutes.