A pet store is a celebration of dogs' existence and an explosion of options. About cats a pet store seems to say 'Here we couldn't think of anything else.' Cats are the Hanukkah of the animal world in this way. They are feted quietly and happily by a minority but there's only so much hoopla applicable to them.
In short it may be said that on paper the obligations to settle international disputes peacefully are now so comprehensive and far-reaching that it is almost impossible for a state to resort to war without violating one or more solemn treaty obligations.