Critical note: For at least the first week, your new dog should always have a leash attached while in your home.
Why this is essential:
Prevents Mischief: Stops dogs from chewing furniture, stealing items, or getting into the trash
Potty Training Aid: Makes it easy to notice signs and quickly take them outside
Teaches Boundaries: Helps them learn where they are allowed to go
Immediate Intervention: Allows you to quickly and safely pull dogs apart if a squabble escalates, protecting both dogs
Safety Feature: Grabbing the collar or harness can make the dog mouth your hand out of reflex. A leash provides safe distance
Behavioral Guidance: Gives you a tool to redirect unwanted behaviors immediately without grabbing the dog
Protects Your Resident Dog:
If your new dog becomes too pushy or overwhelming with your resident dog, you can quickly redirect them without your resident dog having to correct them (which could escalate into a fight)
The time on leash can vary depending on the dog—err on the side of caution. You can let the leash drag (while supervised) to maintain control while allowing more natural interaction.