I have just taken in a male piggie from someone who couldn't look after him. I would like to put him with my other male piggie who is one of 3 boys but had to be seperated from the other two because he was being bullied. So far I have the two cages together and have put my current one up against the cage bars of the new one. There has been some rumbling and cheek rubbing going on but no teeth chattering or other signs of aggresive behaviour. How long should I have the cages together before I can put them in the same cage?