Hi Mariann,
Unfortunately, seizures in a middle aged to older dog are usually not a good sign. It's rare for them to occur due to vitamin/mineral deficiencies from diet. An increase in frequency of seizures and length can also be an indicator of a worsening prognosis. There are a great many things that can cause seizures and the best thing to do is have her examined by a veterinarian and consider full panel blood work, including a thyroid test. Most of these panels can be completed for just under $200 and can provide a lot of information as to what is going on physiologically with regard to certain organs and metabolism. There is no one specific test for seizures and that is why it is best to start with a broad spectrum panel. It's also important to understand and review any other changes in her behavior over the past several months that may indicate underlying disease. If her blood work is within normal limits, my suspicion for cancer as an underlying cause of the seizures increases. Idiopathic epilepsy (unknown cause of seizures) is common in younger pets, not older pets, so unless she has had seizures in her younger days that have gone untreated, I would not expect this to be a likely differential. The next step is getting her evaluated and running the blood work. We will then have more information about potential causes and treatment options.

I hope this sheds some light on potential causes of seizures and the need to be reactive with her condition. Failure to treat an underlying cause of seizures can potentially create more severe disease and as a result, more seizures that become more difficult to treat.

Best wishes to you both and let me know if I can address anything else. I hope this is something treatable and that we can get her on some medications shortly to help out.