Dog seizures

My poor beagle keeps having seizures. The last one was a couple months ago, which at the time I did not know that's what it was, but after this recent episode I can tell now. She falls down, gets real stiff and starts shaking just like when a person has one. I'm obviously going to be taking her in now ASAP but I'm just wondering if anyone else's dog does this and if they ended up being okay?! So scared :(