* Futures down: Dow 26 pts, S&P 7.75 pts, Nasdaq 46.5 pts
By Tanya Agrawal
July 28 (Reuters) - U.S. stock index futures were lower on Friday as Amazon's profit miss took a toll on technology shares.
* Amazon's shares were down 2.96 percent in premarket trading after it reported a 77 percent drop in profit as its rapid and costly expansion into new shopping categories and countries showed no sign of slowing.
* The fall weighed on the tech index, which has been the best performing sector this year, leading the S&P 500's 10.6 percent run in 2017.
* Facebook, Google parent Alphabet and Netflix, part of the high-flying "FANG" stocks, were also lower.
* The Dow Jones Transport Average, often seen as a gauge of the economy's health, closed down 3.1 percent on Thursday, dragged lower by a worrisome outlook from package delivery company United Parcel Service.
* Still, the Dow industrials posted a record closing high, helped by strong quarterly earnings.
* The second-quarter earnings of the S&P 500 companies are expected to have risen 10.7 percent, compared with an 8 percent increase expected at the start of the month, according to Thomson Reuters I/B/E/S.
* Risk sentiment also took a hit following the failure of the Republicans to repeal Obamacare in a tight Senate vote overnight.
* Investors are worried about the ability of President Donald Trump to legislate his pro-growth agenda of tax reform and higher spending on infrastructure.
* Investors will be keeping an eye on the U.S Commerce Department's advance estimate of second-quarter gross domestic product, which is likely to have grown 2.6 percent, compared with a 1.4 percent rise in the previous quarter. The data is expected at 8:30 a.m. ET (1230 GMT).
* Advanced core PCE prices for the second quarter are forecast to rise 0.8 percent from a 2.0 percent rise in the first quarter.
* Starbucks fell 5.7 percent after the world's biggest coffee chain reported a fall in net income.
* Merck was up 1 percent after reporting a jump in quarterly profit.
* Chinese internet search engine provider Baidu rose 4.3 percent as quarterly profit jumped.
Futures snapshot at 7:03 a.m. ET:
* Dow e-minis were down 26 points, or 0.12 percent, with 21,082 contracts changing hands.
* S&P 500 e-minis were down 7.75 points, or 0.31 percent, with 153,177 contracts traded.
* Nasdaq 100 e-minis were down 46.5 points, or 0.79 percent, on volume of 37,100 contracts. (Reporting by Tanya Agrawal in bengaluru; Editing by Anil D'Silva)