it might be a very stupid question. Man-tou's been trying to hump bambi. I know people say humping is more of a dominance thing than sexual thing, but do they get erection when it's not sexual?  Man-tou is almost 5 months and has started humping Bambi (male and neutered), and i notice that Mantou gets erection when he humps....
 
My vet suggests to neuter Mantou when he's 6 months old.   it's stupid..but will he ejaculate everywhere???  

  Note: Man tou hasn't lifted his leg when he pees