In order for any item to work in IMVU it has three requirements Although both show Armatures with a number of bones it's not a requirement they have as many as shown (three is the bare minimum - the avatar root, the pet root and a final bone to which the pet is directly linked through vertex grouping). The images below show the top, side and front view of two animated Pets made for IMVU using Blender 3D - ' Monster in a Box' and ' Tomato Joker'.
