Do you think that the dog does not always come when called because he is afraid.>>>>

Possibly.
When your husband calls his dog, and he comes to your husband, he should
NEVER punish the dog.
Have your husband use a toy or a favorite
treat for awhile when he calls the dog over. Reward him for coming by with
praise, playing, or treats etc.
Spanking a dog is NOT necessary and
can actually do more harm.
Usually a rough sounding voice "NO" or
Leave it" etc.
is enough punishement for most dogs.

At one year old it is quit possible
he still could be submissive peeing.
For the first 2 years of our Terriers life she would pee when ever she would greet us,
strangers or the other dogs. (she has never been hit).
As she matured she grew out of it, but will
still submissive pee to our Alpha dog.

Try Training with positive methods.