I would be questioning WHY a pet of mine would be so fearful and threatened by my husband. What did/does your husband do to your scottie to make him so distrustful and scared of your husband?
Let me tell you 2 stories:
#1 - a girl and guy become a steady live in couple... he has 2 hunting dogs (labs) she has a cute smallish mix dog. The smallish dog becomes fearful of the guy because he yells at him, shoves his nose in the occassional mess he made, etc. Dog begins growling and hiding from her boyfriend. One day, bf takes her dog for a walk and it 'suddenly runs into traffic in a slow residential neighbor hood and is hit by a car'. The bf who makes a lot of money said he'd pay for the dog to be put down, but not to heal him from the injuries. This man most likely ran the poor dog into a frenzy and into the path of a car... problem dog taken care of and now his dogs rule the house.
#2 - again, man and woman move in together... girl's cats are starting to pee and poop in hiding areas and are not as quick to roam the house as they did before man moved in. Gf finds out bf had been terrorizing the cats and hurting them while gf was at work.
Both times, the man was abusive and harming the animals in one way or another which caused the animals to be fearful, threatened and agressive when cornered by this person.
I'd really be asking your husband what the hell he did to your dog! Then once the truth comes out - I'd consider possibly charging him with animal cruelty. In #1 story, girl married man and continues to lie about his behavior and manipulation being the source of her dogs death. Story #2, gf kicked out bf and found out later he had a background of harming animals and past gfs as well...