Our youngest has MS and a seizure disorder and we've been lucky enough to have had 2 seizure alert dogs for her. Her first was in 2003 and there were only 2 places in the country that even trained seizure alert dogs at that time. Her first dog died in 2013 and we were able to get another in 2014. It usually takes at least 2 years to train these dogs before they can even be placed and I have to tell you, both of the dogs have been absolutely amazing. The first was a black lab and the one we have now is a golden lab. 

Do your research on these places who claim they train service dogs and ask for references. These dogs are not cheap, usually they will run around 20K (we got her first dog thru Make A Wish and the 2nd thru fundraising) and if trained correctly, worth every penny.