Conor McGregor has called longtime rival Floyd Mayweather a 'dog' following the American's threat to YouTube star Logan Paul.
Mayweather took to Twitter on Thursday to send a warning to Paul, in which he said he 'put a muzzle on a UFC star' referring to McGregor.
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But 'The Notorious' hasn't taken the jibe lying down and replied to Mayweather with a picture from their super fight.
McGregor is stood over the 43-year-old and its captioned with a singular dog emoji.
The former 'Champ-champ' lost to Mayweather back in August 2017 but the bad blood between the pair exists to this day.
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Stories of Mayweather fighting an exhibition bout with Paul sprang up earlier this year.
"These YouTube girls better find some Barbie dolls to play with cause I'm not the one for the kid games," he said.
"Three years ago a fighter from the UFC said my name and I had to put a muzzle on that bitch. @loganpaul can get the same treatment before I go conquer Japan again."
Paul responded to Mayweather's challenge with a simple comeback of "50-1," quoting Floyd's original threat.
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Mayweather updated fans on his career plans earlier this week and stated on Instagram: "Tokyo, Japan, I'm coming back, in 2021.
"I know the Olympics is in Japan in 2021, but me, myself, Floyd 'Money' Mayweather and my team will be doing something big in Tokyo Dome ... Japan, I'm on my way."
He then called into a press conference on Monday for 'MEGA 2021' to reveal he would be part of the event on February 28 at the Tokyo Dome.
"Japan is one of the most wonderful countries in the world. Tokyo is also a wonderful city. I want to entertain Japanese people," he explained.
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"I train a lot and make an effort as usual. I want to prepare to entertain people.
"The last time I performed in Japan, I didn't practice that much. I want to prepare well this time."
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Featured Image Credit: Conor McGregor/TwitterTopics: Conor Mcgregor, Logan Paul, Boxing News, Boxing, UFC, MMA, Floyd Mayweather