Hello. Thanks for the question. I'm not able to text, so correspondence will have to be on this thread.
Seizures in dogs can be due to many things. The most common cause in dogs 1-5 years old, is epilepsy. In dogs > 8 years of age, the most common cause is a brain tumor. After a dog has a seizure, the liver enzymes can be elevated. A value of 370 wouldn't worry me. That should go down on it's own.
If you want to know the exact cause of the seizure, an MRI or CT of the head is needed. That's the only way to diagnose a brain tumor definitively, as it is in people. The treatment options are limited due to expertise. There are options, though. You can have some tumors removed surgically. Radiation therapy is an option.
Here is a nice handout on seizure disorders in dogs:
And one on meningiomas in dogs, the most common brain tumor:
I hope this helps, let me know if you have any other questions.