*S&P 500 coming off eight straight sessions of gains. *Dow down 0.1 pct, S&P 500 down 0.2 pct, Nasdaq up 0.2 pct. NEW YORK, Jan 28- U.S. stocks edged lower on Monday, with investors reluctant to make big bets following an extended equity rally, though an outlook from heavy equipment maker Caterpillar eased investor fears about a slowdown in China.
*S&P 500 coming off eight straight sessions of gains. *Indexes: Dow up 0.1 pct, S&P 500 flat, Nasdaq up 0.2 pct. The S&P 500 is coming off a streak of eight sessions of gains, the longest winning streak for the index in eight years.
*Caterpillar higher after fourth-quarter results. *S&P 500 coming off eight straight days of gains. NEW YORK, Jan 28- U.S. stock index futures pointed to a modestly higher open on Monday following strong data and results from Caterpillar, though gains were slight after a rally that took the S&P 500 above 1,500 for the first time in more than five years.
*S&P 500 dips after eight straight sessions of gains. *Dow up 0.03 pct, S&P 500 down 0.01 pct, Nasdaq up 0.4 pct. The rally has left the market vulnerable to a short-term pullback of up to 3 percent in the S&P 500 as bullish sentiment continues to rise, according to Richard Ross, Auerbach Grayson's global technical strategist.