What are the most common animal viruses?

The most common health problem for animals is parasites such as fleas or ticks.

There are several categories of virus that affect animals (including humans), a quick online search with this specific question results in over 3.9 million "hits". A precise list of the most common animal viruses would be difficult to determine. Here are examples of some of the more recognizable ones.

Alphaviruses are primarily harbored and transmitted through mosquitoes . Of the thirty known species, 8 can be transmitted to humans. This category includes what are commonly termed "sleeping sickness" or encephalitis.
Paramyxoviruses are responsible for many diseases in mammals (many of the distempers), birds and man and can be highly virulent including some readily transmissible from their normal host species to humans.