Infections of the Digestive System in Dogs
| Organism | Examples | 
|---|---|
| Viruses | Canine parvovirus, canine coronavirus, canine rotaviruses, canine astroviruses | 
| Rickettsiae | Neorickettsia helminthoeca (salmon poisoning) | 
| Bacteria | Salmonella species, Yersinia enterocolitica, Campylobacter jejuni, Clostridium species, Mycobacterium species, Shigella species, Brachyspira species, Escherichia coli | 
| Protozoa | Isospora species, Sarcocystis species, Besnoitia species, Hammondia species, Toxoplasma species, Giardia species, Trichomonas species, Entamoeba histolytica, Balantidium coli, Cryptosporidium species, Neospora species | 
| Fungi | Histoplasma capsulatum, Aspergillus species, Candida albicans, phycomycetes | 
| Algae | Prototheca species | 
| Numerous |