Male guinea pig

[Dezlovesyou]

I just recent put a baby boy and what I think a older male together and all I hear it running and rumble and sometimes teeth chattering but that it no fighting or anything so what does that mean ?

 

[Piggies&buns]

Chasing, rumbling, teeth chattering, mounting are all dominance behaviours. They will be establishing their relationship and hierarchy. As long as there is no fighting, then you need to leave them to it to work things out between them. The guides below explain
Bonding and Interaction: Illustrated social behaviours and bonding dynamics
Dominance Behaviours In Guinea Pigs
A Comprehensive Guide to Guinea Pig Boars

 

[Swissgreys]

@Piggies&buns has linked to some excellent threads above, but I also wanted to add that it may be wise to confirm both of your piggies are boys.
If you are not 100% sure you will quickly end up with more than just 2 piggies.
Our illustrated sexing guide should help:
Illustrated Sexing Guide

 

[Siikibam]

Did you put them in a neutral area or just out one in the other’s cage?