My dog gets upset when I try and brush my other dog. Cordelia is just over 7 months and if I try and brush other dog she freaks out. Whimpers, and tries to get brush away from me. She doesn't really need brushed herself much so its not like she is scared I'll try and use it on her. Just seems odd...Could she have some abuse in her past perhaps and she thinks I am going to hurt her playmate?