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.
The most common health problem for animals is parasites such as fleas or ticks.
Macro viruses
The most common are network worms like shohand .There are also download viruses and malware and the storm worm
Penicillin is the most common antibiotic for viruses.
Just regular old level 1 computer viruses.
The most common animal/s are insects.The most common insect is a fly
There's so many here's a few:TrojanWormBloodhoundBeastThose are the most common and dangerous viruses.
The most common problem following an animal bite is simple infection
I wouldn't say most 'popular' I'd say most common. If there were to be a most common animal, it would be cats.
What about microbes and viruses? If you mean like land animal, I think it's the black widow
Attack by viruses attack by hackers
the most common animal in the southern ocean is the Cape Petrel
stable viruses are very symtom, for example influenza. and viruses that are not stable, they are like animal viruses...