
As mentioned I have 2 Patts, but they were litter mates and have spent their lives together. Unfortunately Patts have a bad name for aggression with other dogs sometimes, although I have never found this with my two. I have heard of Patts being stolen to be used as fighting dogs, which makes me feel sick but there are some bad people out there.
Our two are part of a gang of 7 dogs, all rescues and all shapes and sizes and they get on really well together, but you have to be very careful on the temperament of a new dog if you plan to bring one in. It could work if they are suited character wise, but at the same time it could go horribly wrong.
Even though our Patts are part of a gang, they tend to go off on their own to do their own thing ( hunting) and very rarely play with the other dogs, so if you get another dog then A) choose wisely b) make sure you are doing it for you and not your dog.
You will need time to make sure they are ok together, which means not leaving them alone together when you are out etc etc, so you need to be aware of the extra time you will need to find in your life with an extra responsibility.
I would not have thought it necessary to get another, but it really is your choice, but please think well and hard first.