Have to say that these dinosaurs don't really look like they're dancing. They appear more to be mingling and chatting and it wouldn't look out of place for trays of nibbles to be passed around.
Before I start speculating what a tray of nibbles would be acceptable to a T-rex : here's Dino Disco II - the long awaited sequel to Dino Disco.
Single loop design house/ tag collar made with tough grosgrain trim securely stitched on to black high quality webbing.
Size available: Standard (28cm/11" to 47cm/18.5")
Dino Disco II House/ tag Collar
Width: 25mm (1 inch)