My name is Jasper!

Jasper is very sweet, uses dog door, great on leash. Unaltered, lilac merle, almost 3 years old. My older shepherd has started being very aggressive towards him, so we unfortunately need to find him a forever loving family. He has not been on heartworm meds recently and needs his vaccines. My youngest child is 12, so I'm not sure how Jasper would be with younger children. He does get rough when excited. He gets along with my other dogs and cat but not sure about others. He has never been aggressive towards another dog.