Bailey is a 3.5 years old male Shar Pei who is entire.   He has never really shown much interest in humping people or dogs but all of a sudden anyone that comes round the house is fair game!  We do tell him Off and he does get off them but its getting embarrasing now.  I think its kind of weird that all of a sudden he has started showing this behaviour.  Anyone got any ideas?

Thanks lots

Maybe there's a bitch in season nearby??

i don't think so as its been happening on and off for a couple of months now.