You are not saying how old the dogs are. Are they up to date on shots? Ginger is right. If it has that strong an odor, best to get them to a Vet and, yes, so take a fresh stool sample with you.
This could be serious. At the least your dogs could get dehydration (which can kill) -Or they may have Parvo virus which can also be a killer.
I don't think you should delay, but get them both to a vet.
Hopefully it isn't Parvo.
But if the diarrhea has been going on some time -a day, two days, then they are in danger of severe dehydration even if they are drinking water. They may need a fluid I.V.
Get them checked out. Take a sample of poop with you if at all possible.