It’s scary when dogs in the same household fight. The solutions can be as simple as feeding the dogs in different areas, or as complex as implementing a behavior modification plan for inter dog aggression.
Your first steps are to identify triggers and situations when the dogs are more likely to fight. Manage the environment so the fights are less likely.
Remove high value toys and food items; avoid situations that are known to trigger fights. This means you may have to kennel one, or both, dogs. If your dogs are not keen on kenneling, you will need to teach them to relax in the kennel.
Each dog should be able to to perform these basic obedience commands:
Look, Here, Sit, Down, Stay, Go-to-Place
To teach these commands, you’ll need a conditioned reward marker, and a reward system.
Obedience training, the reward system, and a conditioned reward marker are very important communication and motivation tools. These will increase your relevance to your dogs, and the dogs will begin to listen to you, and think about their behaviors.
The aforementioned tools and steps will create a healthy relationship.
After you have developed a relationship, you can work with your dogs, using specific triggers.