answer:Yes, it sounds like they do. I’ve seen recommendations for keeping the dogs separate at first, so that they cannot see each other. Take turns to allow one or the other out and about in the house, without seeing the other. This will allow the newer dog to get used to the surroundings, and both dogs to get used to the other’s scent. When your first dog no longer furiously tries to follow the other’s scent around the house, it will let you know that you can try introducing them. Don’t do this in the house, but take them to a neutral but confined space, so that they can be off the leads. As in your property, take turns to let them run around and leave their scents, then allow them to meet there. No leads. Good luck, and welcome to Fluther.