Shortly after we began flyball her attitude changed.  When she was tired she would show her teeth to us when we would try to pet her.  We made adjustments to our behavior leaving her alone at night but that all changed when she bit our son on the hand one night after flyball practice.  We took her to the vet expecting the worst (euthanasia) but our vet didn't believe that we needed to put her down and did a full blood workup and put us in touch with a behaviorist.
 
The behaviorist had our vet send a blood sample to Michigan State University for a full Thyroid panel and we discovered that her thyroid levels were almost non-existent.  Our vet prescribed .7mg Levotabs and things seemed to be on the right track.  We continued to monitor her thyroid for the next 2 years with bloodwork every 6 months and we were very happy with our Jenny's new attitude.

That all changed last July when she severely attacked a friends dog while we were at a flyball tournament in Ohio that forced us to quit our flyball team.  We sought the help of dog behavior specialist Brenda Aloff and even switched vets.  Our new vet discovered that Jenny's medication levels were too much for her and switched her to .5 mg Soloxine.  We also continued with Brenda working on resocializing, obedience and specialized handling techniques.  

All was going well when one night out of the blue Jenny attacked our son again this time biting him on the face sending him to the hospital for stitches. She had bitten clear thru the upper lip both on the inside and outside of his mouth.  This time we couldn't help our little girl since the county animal control got involved and we had to have her euthanized  Monday, April 21st at 1:50 P.M.  

We tried everything we could to help our little girl but in the end her little brain just wasn't wired correctly.  At the end we new something was the matter,  when we would look into those beautiful brown eyes of hers we could see that sometimes it looked like nobody was home.....just a look of confusion.  There was nothing we could to do to save our girl and we had to let her go.  There isn't a day that goes by that I don't remember Jenny and smile at the fun that we had and the joy she brought to our lives.

We did learn from our experience with Jenny, and if anyone needs info on Thyroid and seizures check out:
 
 http://www.canine-epilepsy-guardian-angels.com/  

The site has tons of info on epilepsy and thyroid.. It's best to check out the site a little at a time because you can get easily overwhelmed with all of the articles and info.

http://www.brendaaloff.com/  
Brenda Aloff's site.  She has published a few books on canine behavior and body language.  
I would recommend her to anyone needing help with their furbaby.

Kevin