It is a male and, if you have a high enough affection with Stu and Kent, it will have two puppies with their dog, Taro (one is named Jiro). You can increase its affection everyday through picking it up (+1), whistling for it (+1) and feeding it. It can participate and win the Dog Race. You can choose your dog's name, but you cannot customize his color or breed.
The following people will like being shown your dog:
There is a notable glitch where Karen will not register as being given a gift when shown your dog. This can result in you getting her to pink heart in the first night, with roughly 50 showings increasing her heart level.