Aggressive Labradoodle

My sweet 2 1/2 year old Labradoodle has turned aggressive towards the other dog in the household over a period of 1 1/2 weeks. They used to be best buddies and she could not stand to be without him. Now she goes into a rage just seeing him. She is still as sweet as can be with people.

I'm waiting on the test results of her thyroid panel test. As the initial blood result showed low thyroids and high cholesterol.

Anybody else have experienced such a sudden behavioral change in their Labradoodle? Any experience with hypothyrodism? Does the dog go back to "normal" once treated or do they still have "episodes" of aggression.

Beside the thyroids any suggestions on what else could be wrong with her? Anything is appreciated.
Thank you.

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