are chihuahuas suseptable to seizures

my little guy gordi is a 4 lb applehead chihuahua. he will be 4 next month. over the summer he had a seizure and i had thought it was caused from heat exhaustion (he loves the sun, loves to be under the blankets and rarely drinks too much water) however, i believe he just had a seizure today.couldnt walk and he looked "out of it".we live in ny.so i know its not due to heat. does anyone have any information about this?

Yes, chihuahuas DO, in fact, have a higher incidence of seizures than many other breeds, due to years and years of poor breeding choices by people who don't understand proper genetic selection. It's often related to having an open fontanelle (a small 'hole' in the top of the skull where the bones failed to fuse together completely.) I don't care what any chihuahua breeder says, it is NOT normal for them to have that! It is common (due to the aforementioned poor breeding).but that doesn't make it normal.

Idiopathic epilepsy usually begins at 1-3 years of age. But it's a diagnosis of exclusion..meaning that other underlying causes need to be ruled out before starting any medication.

A basic, standard 'seizure profile' includes a physical examination, CBC, blood chemistry profile, urinalysis, thyroid level, and EKG..preferably done all at the same time. (Assuming a heartworm/Lyme/erlichia test and fecal have already been done.) Your DVM should also question you thoroughly to rule out environmental causes. Start a seizure 'journal'..see my previous posts about that. (You can find them by looking in my profile, under my answers.)