Why is my maltipoo humping at 4 months old?

my maltipoo is humping my arm as im holding him. what should I do? is this normal at his age?

He may be trying to show 'dominance' - distract him immediately if he starts - 'Clap' or 'No' so he'll get the message, it's not ok - some opinions are neutering reduces/stops this urge...Good luck !!

WAT THE FRICK IS A MALTIPOO!!!???

if he's four months then u should discourage him doing it ot a toy or sumthing but if its to another dog and the othr owner consents then its alrite. 4 months is the same age as a female dog starts to be able to have puppies so dnt worry to much.

He is trying to be dominent over the 4 year old. He is saying that he is the boss of him or her. When he does this, try and get him a way and yell at him and let him know your boss.

if its a boy hes just at the age when they wanna do that. neutering soon

It's nothing sexual! The dog is trying to establish dominance! Neutering if it's a male, or Spaying if it's a female, will help tremendously!