They go to the pound or the cat/dog shelter or the RSPCA.
A pet is loved, has a home, a family and a name, gets fed and watered regularly, a pet is happy, a stray has none of these. A stray may have been born a stray or kicked out of a once loving home, or jusy wandered a little too far from home and got lost.
There is no real advantage to stray animals. Stray animals over populate areas and they can cause a threat to human health.
Well stray animals are usually abondoned by the parents or abused or neglected by their former owners so sometimes they wind up with no owner because they are at a shelter waiting for a home right at this minute!
Find them a home. Shelters kill animals that don't get adopted.
Stray used as a verb means to wander aimlessly, become lost or to deviate from the path or place where one is supposed to be. As a noun, it most often refers to a domestic animal that is lost or without a home or owner.
Stray animals are homeless animals living on the street or just homeless.
To help stray animals, people have taken in animals, started organizations, raised awareness on animals and donate to other organizations.
save a stray and make his day
The stray kitten is most likely something much more mundane such as an irresponsible pet owners that don't spay and/or neuter their animals.
Stray or estray means that the animal is lost from its home, ranch, farm, pasture or wherever it should normally be. Its like the lost dog you see running around trying to figure out where it should go to get home.
Most animals without a home are considered stray animals. If you are referring to wild animals, you would probably refer to them as migratory, though they would still have what is known as a home range.
Because quite a few people see stray animals as pests, and some people are just plain cruel.