NEW YORK, March 9 (Reuters) - U.S. copper futures stumbled in early trade Tuesday due to a firmer dollar, weaker outside markets and increased investor caution over risky assets, analysts said. For detailed report on global copper markets, click on [MET/L] * Most active copper for May delivery HGK0 dove 3.90 cents, or 1.14 percent, to $3.3715 per lb on the New York Mercantile Exchange's COMEX division. * Range ran from $3.355 to $3.425. * The euro struggled versus the dollar, weighed by debt worries in Greece and Portugal. * U.S. stock futures point to a lower opening. [ID:nLDE628067] * U.S. crude futures were softer as well. CLc1 * "You have weakness across all the industrial commodities," said Bill O'Neill, analyst for logicadvisors.com in New Jersey. * "The euro is the key influence," he said. * Copper has had a sustained run and was due to pull back. * "You have to expect some consolidation" - O'Neill. * Analysts said market was also taking its cue from weaker copper futures on London Metal Exchange. * Focus turning to Thursday's trade data from China, world's largest consumer. * For graphic, click on: here * Supporting copper futures would be steady falls in London Metal Exchange warehouse inventories - traders. * LME copper warehouse stocks fell by 2,700 tonnes to 538,875 tonnes on Tuesday. <0#LME-STOCKS> * COMEX copper stocks were steady at 102,192 short tons as of Monday. CMWSU * Copper canceled warrants are at 26,725 tonnes on Monday, from 3,625 tonnes on Feb. 8. <0#MCUSTX-LOC-GRD> * LME copper for three-month delivery MCUKA3 was bid at $7,434 per tonne at 9:04 a.m. EST (1404 GMT), versus the Monday close of $7,470. (Reporting by Rene Pastor; Editing by John Picinich) (rene.pastor@thomsonreuters.com; +1 646 223 6047; Reuters Messaging: rene.pastor.reuters.com@reuters.net)

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