Bum wobbling & growling

[3 little piggies]

We have 4 boars in 2 indoor hutches.
In each hutch one boar growls and wobbles his bum - always the same boar. The second boar makes quiet wheeking sounds and climbs onto growling boars neck, not mounting, sideways on. Next minute they are then snuggled together or happily munching alongside each other.
Is this behaviour related to asserting dominance?

 

[bubble&squeak4ever]

Yes these are just signs of dominance the bum wobbling and growling is called rumble-strutting. Doesn't sound like anything to worry about to me

 

[Wiebke]

Rumblestrutting (as the bum wiggling/rumbling is called) is a sign of minor dominance (as is mounting from any direction).
You may find this information thread here useful; it also contains further links:
http://www.theguineapigforum.co.uk/showthread.php?76162-Boars-A-guide-to-successful-companionship
http://www.theguineapigforum.co.uk/showthread.php?28949-Boars!-Simple-Dominance-Displays-or-Fighting