An immediate fight is reduced to one or two short skirmishes, usually ending with the flight of a weaker individual.

It comes to more serious conflicts only between males in two situations: when a female is nearby during estrus; during a territorial conflict with strangers. Males raised together tend to be friendly towards each other.

Another typical guinea pig behavior, herd behavior, is found when multiple individuals live together. Anyone who keeps many females with one or two mature males will notice that with each such male a separate group of females is concentrated. Intruders from the out-group are quickly driven away. Within the group, the presence of young males is also allowed, but only until they reach maturity. The consequence of this separation is that real contractions are rare.

Some form of herd behavior can also be observed with only two guinea pigs together. It is defined as “tandem movement”. If animals are able to move freely over a large space, they for the most part keep very close to each other, rushing one after another; as a rule, the first position – the leader, the leader – is constantly occupied by the same individual. Such typical leaders and individuals, subordinate to them, are found in many different species of animals. The leader is usually the strongest, most courageous individual. He usually retains his position in captivity, although exceptions may still occur.