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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 16 years of experience. I look forward to working with you.
I am so sorry Cooper is experiencing this. However, I am a bit confused by the medication Vetmedin is a heart medication. Are you sure your vet diagnosed this as seizures because this medication would suggest your vet thinks this is heart disease with fainting episodes. I may need some clarification.
As well, if your vet was very concerned about seizures a bit of diagnostic testing (before an MRI) is indicated such as lab work (CBC, chemistry profile, urine check) to look for potentially treatable medical problems that could cause seizures (e.g., electrolyte issues, liver issues, infection, etc). If, on the other hand, your vet suspects heart disease then a bit of testing is indicated to know what is going on and if more than just vetmedin is indicated. This workup usually involves a blood pressure check, radiographs (X-rays) and echocardiogram, and the same lab work I just mentioned (there are some medications we may not be able to use if there is existing liver/kidney disease). Some veterinarians may not be able to do the echocardiogram and that may require referral; although there are in most areas traveling services that can provide this.
Clarification may help me best answer your question.