Me and Mama Dog

Felt very anxious on my journey home from work, not sure if Mama dog would still be with us. This week of damp weather has meant she has been very stiff indeed and in the last couple of days she seems to be loosing the use of her back legs. She doesn't seem in pain and is eating her food, so I'm wondering if the weather improves will she improve or is this a deteriorating situation? She is 18 or 19 years old now and I'm wondering if this is the end of the road for her, any thoughts much appreciated.

Just returned home after an evening out and mama walked over to great me, she will never cease to amaze me and it has been dry today!