Actually, the "pack animal" concept is nonexistent. The term is a somewhat hackneyed reference to "cooperative hunting" or "social predators," with elements of the since debunked "alpha" structure observed in wolf packs. In reality, social predation is, as the name suggests, an attempt by humans to apply a group structure that is fairly unique to primates to higher order mammals (and some fish). Yes, most animals don't have societies in the sense that humans or orangutans might have because they don't have the higher order skills that necessitate task specialization, like toolmaking or animal husbandry, but some aspects social living, like hierarchy and cooperative problem solving, are intrinsic to all animals. In that sense, cooperative hunters are social animals like humans because the human concept of "society" is the most appropriate framework useful to classifying that trait.