I can't really get my head around why anyone would want to hunt guinea pigs!  they're slow as f'ck, they don't bite back, they don't really do anything!  I reckon even a ferret would outrun a guinea pig!  When I was a kids we had guinea pigs and rabbits and even the rabbits would knock the shit out of the guinea pigs, we had to seperate them! 
  
Merecats would be a bit of a challenge I reckon, and they live in big colonies.  Can you imagine having a team of terriers and bolting about 20 of the feckers with a team of ferrets......now that would be entertaining!  They'd be all over the place!!