The order by Clark County District Court Judge Elizabeth Gonzalez delaying the execution marks the first time a pharmaceutical company has succeeded in halting an execution over legal or ethical concerns.
Experts say it would be the first time the opioid fentanyl was used in a US execution.
Brooke Santina, public information officer for the Nevada Department of Corrections, told CNN that it has been advised not to comment on the lawsuit. State officials could appeal right away to the Nevada Supreme Court.
The pharmaceutical company Alvogen filed a challenge on Wednesday, accusing the state of Nevada of surreptitiously obtaining the sedative Midazolam for executions and saying that it did not want the drug used in executions.
Drug maker Alvogen alleges the state illegitimately obtained one of its execution drugs and says that the drug combination proposed is untested.
The judge ruled that based on that letter, Alvogen had a reasonable chance of winning its lawsuit, and she issued the temporary restraining order against the use of the drug. Gonzalez set a hearing in the case for September 10.
The company points to what it called "botched" executions in other parts of the country where their drug has been used. The first attempt-by a different company in Arkansas-failed previous year.
Death penalty states have been forced to find different cocktails of drugs for executions in the face of opposition from manufacturers to having their medicines used in lethal injections. "But the company did not immediately ask to formally join Alvogen's lawsuit", The Associated Press reported.
The midazolam would be used to sedate Dozier before he is killed using fentanyl, a drug at the forefront of the United States opioid epidemic that was also allegedly obtained illicitly. But the state has refused. Fentanyl, a synthetic opioid well known for its role in the opioid epidemic, has "never been used in an execution before".
Jordan T Smith, an assistant Nevada solicitor general, countered at Wednesday's hearing that Nevada did not put up a "smokescreen" or do anything wrong in getting the drugs.
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Todd Bice, an attorney representing Alvogen said the company's lawsuit was not about the constitutionality of the death penalty nor whether Dozier deserved the death penalty - it had exclusively to do with business.
Alvogen said that Nevada law is clear that it is an offence to obtain a controlled drug "by misrepresentation, fraud, forgery, deception, subterfuge or alteration".
The sedative is meant to render the inmate unconscious before he is administered the synthetic opioid fentanyl and then paralytic agent cisatracurium. Fentanyl is used to slow the heart rate, sedate and continue to suppress breathing, and finally Cisatracurium to paralyze the inmate before death.
Mr Bice said that Alvogen does not take a position on the death penalty itself but opposes the use of the drug in a way that is fundamentally contrary to the drug's objective - saving and improving patients' lives.
In court papers, Alvogen also cited instances in Alabama, Arizona and Oklahoma in the past few years in which inmates given midazolam were left gasping or snorting, appeared to regain consciousness or took an unusually long time to die. "It's extremely experimental", as Amy Rose of the American Civil Liberties Union puts it.
"Life in prison isn't a life", Dozier told the Las Vegas Review-Journal.
There's a limit to how much artwork and physical exercise a person can do in prison, Dozier said in court hearings and letters to the Las Vegas judge who postponed his execution.
He was convicted of second-degree murder in the Arizona slaying of Jasen "Griffin" Greene and sentenced to 22 years in prison in 2005, before he was brought to Nevada to face charges in Miller's death.
Miller's torso was found on April 25, 2002, in a suitcase that had been dumped in a trash bin at the Copper Sands apartment complex in the 8100 block of West Flamingo Road.
A witness said Dozier used a sledgehammer to break Mr Greene's limbs so the corpse would fit in a plastic storage container.
They argued that the untried three-drug combination would be less humane than putting down a pet.
Federer was rattled, but the credit belonged to Anderson, who had disrupted his illustrious opponent's serve. I couldn't really get the rallies going the way I wanted to, especially 1-2 punch wasn't working at all.
She said the breakaway Democrats helped Republicans remain in control of the Senate for the past eight legislative sessions. The longtime women's rights advocate fears Kavanaugh will do Trump's bidding if he's confirmed.
Recent reports have revealed that the company will speed up the launch of the Galaxy S10 to unveil the Galaxy X shortly after. The wide-angle snapper is expected to have a 16 MP sensor with a f/1.9 lens on top and a super-wide 123° Field of View.
Jones, who fought back after some initial hesitation, told the woman to "watch out" before punching Ragin. During the course of the fight Ragin also struck a companion of Jones, causing an injury to her hand.
He saidthey discussed defense investment and trade, adding: "We have a tremendous relationship with Germany". Trump said: "We're protecting Germany, we're protecting France, we're protecting all of these countries".
Prime Minister Theresa May said: "Wasn't to be this time but it's been a great journey that's made the country proud". Croatia beat England to book their place in the World Cup final in Moscow on Sunday.
How did we arrive in this nightmare scenario, again? The libertarian-leaning Paul is never one to give up his vote easily. And the spectre of Robert Mueller's Russian Federation probe will hang over the confirmation into the fall.
Crocodiles are farmed for their meat and hides, but large and battle-scarred crocs are usually unsuitable for the handbag market. The caption warned: "Large crocodiles can move around Top End waterways undetected and you should always Be Crocwise".
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