If coming from the racing industry/a trainer, chances are your greyhound will likely have spent all of his life only with other greyhounds. greyhounds are not fighting dogs. Any greyhound that shows a tendency to fight is banned from the race track for life. But, it is likely that your greyhound will find other types of dogs completely new and different, and even something to be scared of or to growl at.
This Fact Sheet will help you if you already have another dog and are homing a new dog, or if your new dog is worried about meeting other dogs.