Your dog is 18 months old, and still showing aggression. The reason may be that the training was not proper.
But it's never too late to make corrections to bad behavior but for you I would suggest to make corrections immediately.
You nee...

Actually speaking dogs are very clean animals who avoid spoiling their own area. But a puppy needs a lot of training which may take time and require patience from your side. There are some puppies which may get trained at three months only but others...

For dogs, whether a new puppy or an older dog, ensuring few essential ingredients is necessary. The first and foremost is health and second is the dog training program.
As the dog grows the training will also change. It starts with steps like h...