May is National Pet Month in the USA, a time to celebrate the love and companionship the furry creatures bring into human lives. It is also a time to spare a thought for pets still awaiting their forever homes. The USA is the world’s largest pet-owning country, with dogs being the most popular. Yet, the explosion in pet ownership has had an unfortunate side effect. As many as 3,000,000 dogs enter shelters every year, according...