Five major reasons why dogs are aggressive

Firstly,Aggressiveness can be defined as the physical or emotional harm to others.
 
Dogs are aggressive due to the way they are been treated by their owners,
For example>
When a dog is not been give attention, this will make the dog think that he is not useful at all and they might even be aggressive to their owners.
And also,when a dog is been chained all day long, and is not been released for even a minute, this makes the dog to  become even more aggressive.
If a dog is  not been fed well, this can also make a dog become aggressive, and it might not even be able to recognize its owner.
Productive aggression is when a female dog is pregnant of when it has already given birth to its pups.
When a dog is been prevented form socializing with other  dogs or animals is a very common way why dogs get aggressive.
If a dog is ill, it leads to aggressiveness and this is common mostly in dogs,and when they are not been treated earlier enough,they tend to become more aggressive.
I love dogs!