My Jack Russell Terrier has been diagnosed with borderline thyroid deficiency. How do I deal with this?

I took my Jack Russell Terrier, named Gypsy Rose, to the vet and she has been diagnosed with borderline thyroid deficiency. Her thyroid, according to the vet, is in the gray zone. She was tested with a 1.4 and a normal dog is 1.5 to 3.5 (this according to him). She is the long-legged version of the dog and I got her from the local Humane Society 2 years ago. I love her to so much and she is such a wonderful and obedient dog. However, I'm concerned because her weight came in at 35.10 lbs. I read she should be between 18 and 23 lbs. She doesn't overeat and I keep her on Pedigree dry dog food. The vet gave me Thyroxine for her to take to try and decrease her weight. What are some of the do's and don't's with this diagnosis and what should I do now? Professional or answers from those with dogs with thyroid problems would be greatly appreciated!

In my experience, this is not a big problem - I had a dog with thyroid insufficiency, and all I had to do was give him a pill once a day.

The vet gave me beef flavored thyroid pills, so it wasnt even hard to get him to take them.

If she has weight issues, I would put her on a better food, though.

I feed my chubby dogs Flint River Lamb and Millet - no fillers, no corn, and lower in calories.

Clover & Sprite Medicine Time for my Dogs