More recent evidence proves that the major contribution to the smell of flatus comes from a combination of volatile sulphur compounds (vsc).[5][12] it is known that hydrogen sulphide (h2s), methyl mercaptan, mm (also known as methanethiol, mt), dimethyl sulphide (dms), dimethyl disulphide (dmds) and dimethyl trisulphide (dmts) are present and cause the smell.Those compounds are the one percent that cause the smell.
Symptoms include a whitening of the lens, which is a clear part of the eye needed for focussing, and the problem impairs sight and may even lead to blindness. The whitening or cloudiness is opaque and thus cannot be seen through. Inherited cataracts can occur at any age in the affected dog.
1 Dogs that develop anterior uveitis (inflammation of the iris) may also show signs of eye pain. 2  There are numerous causes of uveitis. 3  Glaucoma or elevated pressure in the eye can be very painful to the dog. 4  Trauma to the face, eyelids, the eye itself, and the tissues behind the eye may result in dramatic pain. A corneal ulcer or scratch can also cause reflex pain and spasm of the iris inside of the eye. 2  When this occurs, the pupil constricts (miosis), and the iris becomes swollen and the conjunctiva reddened (bloodshot).