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There are three different considerations in such a 13 year old. The first are transient ischemic attacks (TIAs/mini strokes) as you mentioned. The second are complex partial seizures. The third are syncopal ("fainting") episodes. All can cause vocalizing, a change in mentation (mental status), and behavioral abnormalities. It can be a challenge differentiating one from the other but in general, syncope describes a sudden loss of consciousness and muscle tone, usually without motor activity and without postictal (post-seizure) signs such as disorientation, ataxia ("drunken sailor"), and finally sleep; in other words, a fast and complete recovery is expected. Syncopal episodes last less than a minute (otherwise fatal), whereas seizures may last several minutes. Clues of a cardiac problem - heart murmur, arrhythmia (irregular heart rate) - may be present in syncopal dogs.
Has her vet been apprised of these events? A thorough physical and neurologic exam is in order. Particular attention should be paid to her heart. A heart condition might be addressed in a conservative manner by specific heart drugs. Seizures are usually addressed with anticonvulsive drugs. Strokes have no specific therapy.
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