Thanks I appreciate your help@Kimberly Williams - rather than search the internet may I suggest you seek out the services of a health professional working in the fields of disability that the dog may be able to work with ppl in. They may know where reputable service dog providers are in your State and possibly even assist you to approach them & find out information that you need.
I'd be a little wary of thinking you require one breed type and only one. It's true there are established breeds with a good reputation but depending on what the dogs role will be in your home there may be other suitable breeds and mixes.
I'm in Aus., so cannot help with USA.
But good luck I hope your search is successful.