Import these files to the following paths:

For the Red Dragon Spawn (found in the folder "Dragon Spawn Red")

DragonSpawn.blp           Units\Creeps\DragonSpawnRed\Dragonspawn.blp
DragonSpawnRed.mdx        Units\Creeps\DragonSpawnRed\DragonSpawnRed.mdx
DragonSpawnExtras.blp     Units\Creeps\DragonSpawnRed\DragonspawnExtras.blp
DragonSpawnRed_Portrait   Units\Creeps\DragonSpawnRed\DragonSpawnRed_Portrait.mdx

For the "Pink" Dragon Spawn (found in the folder "Dragon Spawn Pink")

DragonSpawn.blp           Units\Creeps\DragonSpawnPink\Dragonspawn.blp
DragonSpawnPink.mdx        Units\Creeps\DragonSpawnPink\DragonSpawnPink.mdx
DragonSpawnExtras.blp     Units\Creeps\DragonSpawnPink\DragonspawnExtras.blp
DragonSpawnPink_Portrait   Units\Creeps\DragonSpawnPink\DragonSpawnPink_Portrait.mdx

Original Models By Blizzard
Skin and model changes by Ammorth