We love our sissies. Nick is having a hard time remembering that lately as he thinks Angel is a toy we got for him to play with, but I will beat the memory into him until he is nice to her.
I know it is a little scary, but Greyhounds are known for "Smiling". Shawnee is so happy, several Greyhounds I know will do this when they meet someone and bark at the same time, they are literally "Smiling" like a person. It can be a little intimidating when they run up to you showing their teeth.