Your dog will start to vomit more often, and as the acid starts to build up, ulcers will form in the gastrointestinal tract and
in his mouth
. Of Course, they won't eat, because they are feeling sick, other symptoms may also appear...depression, incoordination, seizures,sleeping more often,confusion, rapid weight lose, shivering or trembling.
I have read that this disease is not painful....That is what I have read many times...