Boxing is a physical sports. It involves two players punching each other inside the square ring until one of them kisses the canvass, pass out, and sleep longer than the ref's 10 counts. So when Floyd Mayweather (the senior and the junior) started talking trash and accused Manny Pacquiao of doping, I started to think that Floyd (the junior) is really feeling chicken about fighting the Filipino boxing icon.
The Mayweather camp is just making up stories to discredit Pacquiao and blame the dope if in case Floyd kisses the canvass during their fight. The Mayweather camp is really not keen on slugging it out with the Filipino boxer and are making up stories so they will have reasons not to fight Pacquiao.
A great boxer lets his punches do the talking and Mayweather seems to be otherwise. What are they scared of? Why do they have to do all those accuses against the pound-for-pound king instead of just leveling it up on the boxing ring? A chicken does create noise when it is scared. Mayweather is the best example.