Microtus pennsylvanicus
The common field mouse (Meadow Vole) is the most common mammal in North America.
Cats, dogs, and even cattle.
I wouldn't say most 'popular' I'd say most common. If there were to be a most common animal, it would be cats.
I don't know how it would be possible to count them all -however I do think it could be the US's most common wild animal.
American Eagle
The most common field for a veterinarian in the US is small animal or companion animal medicine exclusive, focusing on treating cats and dogs.
The most common animal/s are insects.The most common insect is a fly
Cattle,Swine,Poultry.
The most common problem following an animal bite is simple infection
the most common animal in the southern ocean is the Cape Petrel
Most, if not all, mammals can be infected with rabies. Worldwide the most common carrier is dogs. In the US the animal most likely to infect humans is bats. Raccoons and skunks are also common carriers.
The most popular animal is the lion or llamah. ♥
Insects, especially ants and termites, are the most common animal in nearly all deserts.
The most common element in wool is animal fleece.