Vet! That's not normal and there are a variety of differentials (the technical term is "cervical ventroflexion" if you feel up to some googling), some of which are quite serious. Try not to manipulate his neck at all, and try to keep him from moving it.
She's been walking around with her nose almost on the ground and hasn't raised her head in a week and you are just now questioning whether that is normal? Sounds like a vet visit is needed asap. Poor girl.
I have been watching her for the past few days.
I think her eyes are bad.
When she needs to step up she raises her head to see where to put her foot - I don't think she can see where she steps unless here eyes are half a foot from the nest step and when your nose is four inches long well...
When the old jack started losing her vision, she started carrying her head low. Her neck is perfectly fine, she will raise it no problem for treats, and still has no issues kill shaking her stuffies.
Cervical arthritis can cause minor pain, which is certainly possible in older dogs. Getting a vet appt to test out her eyes and manipulate her neck may not be a bad idea to ensure she is not in any pain.