Central banks could send dollar higher: Doll

Bob Doll: US will contribute more global GDP than China

The potential combination of Federal Reserve tightening and European Central Bank easing provides the "perfect recipe" for the dollar to continue strengthening against the euro, said Bob Doll, chief equity strategist at Nuveen Asset Management, on Wednesday.

"It's hard for me not to see the dollar rising compared to the euro," Doll told CNBC's "Closing Bell."

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The euro hit a nine-year low against the dollar on Wednesday, falling as low as $1.18. Weaker growth and falling prices in the euro zone have led to wide speculation that the European Central Bank could ease policy.

Read MoreEuro zone deflation: Why it matters

With the Fed potentially raising interest rates as the euro zone eases, the dollar could bulk up even more, Doll said.

But the Fed could help send the dollar lower against the euro. If Fed board members signal concern for the dollar in the near future, they could "talk the dollar down," said Larry McDonald, senior director at Newedge USA.

"If the Fed mentions the dollar as a concern, there's so much pent-up bullishness it could create a reversal," McDonald told "Closing Bell."

Read MoreEuro slide could take it to parity with dollar

Easing in Europe could also send the dollar lower against the Euro, CNBC "Fast Money" trader Brian Kelly said on "Closing Bell." If Europe eases monetary policy and investors begin to rush in, dollars will be sold to buy into the euro, he said.

Even with the potential shift, Kelly sees the dollar rallying for the second half of 2015.