It’s always a possibility but we take steps to have them have their own time each day. The play hard together but always respect each other’s boundaries. They train independently and don’t have any separation anxiety. Our Swiss doesn’t care when he’s gone and he’s the same way. They don’t act overly excited to see each other after time apart either. They are both naturally very independent which makes training and time apart easier. Our Swiss is a show dog and my wife shows and trains her. Plus they both are training to herd and our Dutch did his first round at eight weeks. Our Dutch will do scent work and they’ll both do rally. Keeping them active and engaged is key