Hi guest,
Your situation is rather unusual.
My cocker mix had seizures begin to develop when she was about 18 months old. The first time, we thought she pulled a muscle. She jumped off the sofa and couldn't stand up after that for about 2 minutes. Then she was fine. When it happened about 3 months later and continued much longer than the first one, I took her in to the vet.
They did a blood test to rule out certain diseases/disorders that can manifest themselves by begining with seizures. When those came back negative, he told me about seizures. The research that I've done seems to confirm what he told me. Usually seizures show up in dogs 12months and older. So yours starting out so young is extremely worrisome.
Canine Epilepsy and other seizures is a wonderfully informative site that might be able help you with answers.
I was told by my vet that if Chienne had 4 or more seizures in 6 weeks time, then medication could be addressed to help her. Except for a really horrible experience where she stayed with someone else, she would have 2-3 mild seizures a year. This was manageable off meds.
I found that if she was stressed and over heated (NM weather :rolleyes: :) ), a seizure would occur about 5-6 days afterwards. She also had to have regular walks/runs to cope with her stress levels. We discovered that if she didn't get out on a long walk about every 8 days, she'd have a mild seizure too. So over and under exercise makes a difference in the brain.
Moving her since to cooler climes has really helped out. We're down to about a seizure once a year or longer now. It's fairly predictable now, since she's just over 7 years old. The last time it happened was in June, exactly 5 days after a long, very hot drive to our vacation destination and meeting up with a huge nosy (but nice) Bernese Mountain dog who was ignoring her back off 'requests'.
Living with a dog who has seizures is doable as you can see from John and I :) I know others who have their dogs on meds, but also developed them later in life. With you getting your dog for the intention of racing (very stressful, esp. the waiting and training times) + her having siezures so young, it is a definite concern for long term health.
good luck,
toodles