Shelter pets need up to 3 months to truly settle into their new homes, and may need even more if they have a history of abuse or neglect.

Do not rough-house or play tug-of-war with your new dog, even if s/he is playful because this could establish unwanted dominant behavior.

Give your new pet space, and gently correct behaviors that you do not approve of using a water bottle or shaker can. Don't pull on their collar or try to force them into a kennel or room - you need to build trust.

At least for the first few months, feed and give treats to your new dog separate from your current dogs, even if they are getting along.

If your new dog is scared, they may be a flight risk. Do not leash walk him/her until s/he settles in and bonds to you, which could be months. Be sure your fence is super secure, and do not allow them in the yard alone because they may dig out or jump over, even if the fence is 8ft tall.

Do not touch your new dog or his/her food bowl while s/he is eating, and don't try to forcibly take toys away until you learn if the dog has food aggression or resource guarding issues.