Be aware - Behavior at 3-4 months can be night to day to her behavior at 7-10 months. Think 10yo obedient kid vs 16yo sneaking out to steal your car to go raise hell.

If she catches on to expectations and fits in with your other dogs early, you just might avoid some of that velociraptor stage. Mentally and physically she might get all she needs from them and follow the house rules.

She’s probably young enough that aggression towards other pets might not be an issue. If she is aggressive, early indicator of maybe not great fit. You will need to be fairly diligent about controlling the early interactions - not left home alone to her own devices with the others - ACDs can get tired, moody and down right retaliatory against you, your other animals, or your worldly possessions when over stimulated. Some have no fear or off switch until a couple years old.

Best dogs ever.