Vaccine brands & seizures?

[Samba]

I recently heard that particular brands of vaccinex may cause seizures in Shelties. Does anyone know about this? Is there a particular suspect ingredient?

 

[Greenepony]

I hadn't heard with shelties in particular but I was talking to my vet and she said some of the old types of vaccines had fillers that caused more reactions (I think Parvo in particular) but a drug company has come out with a more filler-free (and therefore smaller dosage) that has a lot less side effects. Is that what you were thinking of- or are you thinking of ivermectin in dewormers?