* Ex-Japan Asia shares flat, Nikkei down 0.1 pct

* Pfizer-Allergan deal fails to inspire investors

* Dollar near 8-month peak, metals weak

By Hideyuki Sano

TOKYO, Nov 24 Asian shares dragged their feet onTuesday after a healthcare mega-merger failed to impressinvestors while the dollar held firm near an eight-month high asinvestors grew more convinced of a U.S. rate hike next month.

MSCI's broadest index of Asia-Pacific shares outside Japan was almost flat while Japan's Nikkei dipped 0.1 percent after a long weekend.]

Wall Street shares edged down on Monday with Pfizer's plan to buy Allergan plc in a $160 billion dealquickly drawing criticism from politicians as a tax dodge.

"Investors may feel that even if this deal comes through,this will become the last of this sort," said Yoshinori Shigemi,global market strategist at JPMorgan Asset.

For now, markets have shown no immediate reaction toworldwide travel alert issued by the U.S. State Department,warning U.S. citizens of the risks of travelling because of whatit described as "increased terrorist threats."

The dollar's index against six major currencies rose to aneight-month high of 100.00 , edging near its12-year peak of 100.39 touched on March 13.

Comments from San Francisco Fed President John Williams onSaturday citing a "strong case" for raising rates cemented theattraction of the dollar.

Whether the dollar can rise above its March peak coulddepend on the pace of the Fed's rate hikes next year.

"In March, interest rate futures were pricing in a muchfaster pace of rate hikes," said JPMorgan Asset's Shigemi.

Markets are currently pricing in two more rate hikes nextyear after a likely December move.

Still, in contrast to the Fed, the European Central Bank iswidely expected to add stimulus next week, including deepening its already negative interest rates, making banks pay, not receive, interest on deposits at the central bank.

The euro fetched $1.06365, having fallen to aseven-month low of $1.0592 in U.S. trade on Monday.

Precious metals were under pressure, with gold hovering justabove last week's near six-year high of $1,065.50 perounce, last trading at $1,069.90.

Silver hit a six-year low of $13.925 per ounce andplatinum to a seven-year low of $839.50.

A strong dollar also hit base metals, which have beensuffering from concerns about slowing demand from China.

Copper, which has fallen 12 percent so far thismonth, stood at $4,490 per tonne, near 6 1/2-year low of$4,443.50 hit on Monday.

But crude prices won a reprieve after Saudi pledged to worktoward oil price stability.

U.S. crude futures firmed 0.8 percent in early Asiantrade to $42.10 per barrel, compared to three-month low of$38.99 hit on Friday. (Reporting by Hideyuki Sano; Editing by Eric Meijer)