Spamming pet commands is a good way to lose a pet.
Pets no longer go wild, except for Pack animals (Giant Beetles, Pack Horses, Pack Llamas). He is correct though, telling a pet to follow you, then kill, will oftentimes trigger a Disco attempt if the pet has Mana for it.
When it comes to effectively using pet abilities, Less Is More. The less abilities a pet knows, the more it'll spam the abilities it does know, Mana permitting. Cu Sidhes innately come with Bleed Attack, and also spend 10 Mana per bandage Healing attempt. A Cu Sidhe with Disco+CB+Bleed+Healing, will use Disco and CB far less often than a Triton with Disco+CB+Healing. Why i specialize my pets, and avoid overloading them with abilities.