Distemper is caused by a virus of the Paramyxoviridae family.
It is one contagious disease that affects mainly the dog but may also concern other Canids, the procyonids (as the raccoon) and some mustelids (as the ferret, mink).
Leptospirosis is a serious canine disease that is transmissible to humans.
It is due to infection by spiral bacteria called leptospires. There are many types. Each type is called a "serovar".
The leishmaniasis is a disease related to the presence, within the body of an animal, small parasites: the Leishmania. These are transmitted to an animal by the Sting a very close Diptera insect of the mosquito.
The disease is common in the dog while the cat seems very unresponsive.
Human, just as the dog, may be contaminated.
The lacrimal glands, throughout the day, tears which will form a natural protection for the eye : the tear film.
A lack of secretion of those tears will have a dry eye itself responsible for inflammation of the conjunctiva and cornea. This condition is called : Keratoconjunctivitis Sicca.
The heart is an organ which plays a role of pump and allows the distribution of blood throughout the body of the animal. It is made up of 4 cavities and valves.