Why is my spayed young dog suddenly aggressive to my older dog?

Question

I have two female dogs. One is 13yrs. -mix jack russel/whippet? Other is 10 months Schnauzer mix came into our house at 2 1/2 months. After about a month things were good. now things have been great. Ruby, the puppy was just spayed last month. We have a very large yard and they have so much fun. they have drank and eaten out of each other's bowls with absolutely no problem. But last night Ruby was very agressive towards Annabell. Ruby had Anna Bell by her neck. Bad- blood - near ear and neck. Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 26 lbs

Dr. Davis · Accepted Answer

Ruby is probably trying to become top dog as she senses that Annabelle is getting older. I would separate them to eat, and monitor them more in the yard. This can be an isolated incident or it may become serious. I reprimand Ruby if she is acting aggressive, hopefully when she is just starting. I find competing for toys and food makes this behavior worse so eliminating those things to fight about should help. Also make sure you pay attention to both. If Ruby seems aggressive I separate them and put Ruby in a crate until she calms down. While this is natural behavior it can be bad so please protect Annabelle. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Annabelle and Ruby.

Why is my spayed young dog suddenly aggressive to my older dog?

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