That's annoying. Someone met Delta for the first time, that works with my husband. There dog was new to the dog park and very timid. For some reason Delta likes to pick on timid puppies or small timid dogs. Believe you me we are working on the small dogs and she is getting a lot better. Well, I told Delta to stop playing with the timid husky pup because she growled at her and grabbed onto the tip of the tail hairs. Well now the husky pup and Delta are fine and play just fine because the husky isn't timid anymore. The lady told my husband that Delta was mean to her dog. I just brushed it off and made sure Zac told her that Delta wasn't mean. She now knows better I think.