To this class belongs various organic poisons produced in food substances (fish, etc.), as the result of fermentative changes, arising through the presence of bacteria or other minute living organisms.

Although cases of ptomaine poisoning are more frequently met with in the human subject, there is a possibility of the occurrence of such in the dog.

Empty stomach with an emetic, say 20 grains of white vitriol and given in two tablespoonfuls of tepid water.