For more information, see Tricia Power s article, Dehydration in Reptiles . Diarrhea - Frequent, runny stools. This is especially helpful if your iguana is being treated with antibiotics. Acidophilus tablets and capsules are available at health food stores. Your vet can check for parasites and other likely culprits.
Fluid replacement is a good idea, because diarrhea can cause dehydration.
For more information, visit Constipation and Diarrhea in Iguanas , by Melissa Kaplan. Dry Gangrene - Death of tissue on the body. This is most often seen on the tail and toes. Symptoms - Tissue becomes brown or black, dry, hard and brittle. It collapses inward, and the infection can be seen to travel along the tail or toe.