Its very important to note that a seizure in itself is a sign of a disease. Many diseases will cause dogs to have seizures. Epilespy is one such disease and is one of the more common. Others could be severe head trauma, lead poisoning and eclampsia. Unfortunately, in most cases, the specific cause for the seizure is unable to be found by your veterinarian. If the later diseases are ruled out, then idiopathic(cause unknown) epilepsy is presumed.
By all means, take your Maltese to your vet if he/she has any of these signs. Your vet will probably want to do a EEG to confirm a diagnosis of epilepsy.
As far as treatment, not real good news here. Treatment usually involves lifelong use of anticonvulsant drugs. The problem is of course that your Maltese will gradually adapt to the drugs and need larger and larger doses as time goes on. The prognosis is poor, as the seizures may become uncontrolled even with progressively larger doses of these drugs.
I feel epilepsy does have a genetic cause.