my dog cassie has been acting weird. like shes been shaking, yelping randomly, we think she might be in labor but we are not sure??? can anyone help me please i want to know ASAP i don't want her to hurt!

My friends 13 year old spaniel recently started to wet indoors of a night ,she mentioned it to the vet and they said it was his age .This dog usually walks roughly 3 miles twice a day ,but has started to refuse to go more than half a mile, this week he has been leaving most of his dinner as well...