my dogs just started shaking and stopped for a few secons

Question
for almost 1 minute, my dog could not balance herself due to her body shaking and her stomach area wes flexed. she was just staring at me with some shivering back and forth. I am so worried about her, she is 3 years old and the only thing that i have in this world. she is a little overweight.
is she gonna be ok???

Answer
It sounds like some sort of a seizure.  Sometimes a dog will have one, but be OK and never again.  Just to be safe, I would get her into the vet this week.  

If you want her to have a longer life, work on her weight. Evaluate the dog as illustrated in this link, http://www.longliveyourdog.com/twoplus/RateYourDog.aspx  You may want the vet to confirm your judgment. Adjust the dogs food and exercise as needed to reach its ideal body condition.