Hello all. First of all, not sure if this thread is in the correct message board area, but I'm hoping it is. Anyway, I have a question regarding my two Yorkies mother and daughter. Mom is 9 years old. Daughter is 4 years old. The two have been inseparable since birth best friends; playing together, sleeping together, rarely apart. However, just recently, daughter started to become very aggressive towards mom as if she snapped attacking Mom for (from our eyes) no reason. In some cases, we need to keep them apart from one another. Now, they each get the same amount of love and attention so we rule out jealousy. The only thing we can think of is that mom was very recently spayed and possibly she is giving off some scent that daughter it reacting to. But, as mentioned, this just came out of the blue. Any thoughts on this strange behavior?