TOKYO (Reuters) - Asian shares fell on Monday on growth concerns ahead of the third-quarter corporate earnings season, while the euro slipped against the dollar on a lack of clarity over Spain's bailout prospects. As risk-sensitive assets retreated, the dollar index measured against a basket of six major currencies gained 0.3 percent, undermining dollar-denominated commodities. The euro slipped 0.3 percent to $1.2909 as Europe muddles through debt relief measures for debt-saddled Spain and Greece. A stronger dollar and worries that a slowing global economy may further dent fuel demand pushed ...