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There are many reasons why there are abandoned animals. One is because some owners do not want the animal any more because a female dog or cat can make about 12 puppies or kittens each time they give birth.
Another is because some dogs are used for guarding and if they don’t need the dog or it's too old, then they just abandon the dogs.
The wild/stray animals mostly live in dusty places.
The animals are dirty and scared. When you just walk away they will just leave you alone, but if you hit them with something or scare them, then they would most likely bite you.
The shelter usually goes on social media to promote adoption, but mostly they do some events.