Some of the hardest animals to adopt out of shelters are cats who are shy or are in need of socialization with humans. To help cats come out of their shell, you can donate time at your local animal shelter to spend an hour or more petting cats. Just playing with them and showing them that humans can be fun and trusted companions can help shy cats adjust and become more desirable candidates (cat-idates?) for adoption.
ANDREWS MCMEEL SYNDICATION