During World War II, although many animals have served as mascots aboard Coast Guard vessels, dogs were the most prominent. Sinbad, is one of the most famous dogs that served as a mascot aboard the Campbell cutter, keeping the troops company during his travels.
Checks and balances are controls built into our system of government which prevents one branch of government from asserting too much power over the others. For instance, the President may want to declare war, but he must first seek the approval of Congress.