this is really worrying.
imagine what the dog could do if it came across a baby or toddler and ravaged them. you really do have a duty to act, in my personal opinion.
https://www.dailymail.co.uk/news/articl ... pital.html
Under the dangerous dogs act, you have reasonable grounds to have the dog put down if the owner fails to keep it under control, in my personal opinion. the owner could find themselves in court if you were to complain to the police and the CPS were to prosecute. and the police may destroy the dog, as is often practice where dogs do injure people.
in certain circumstances, you would be allowed to kill the dog in self defence. If your husband were to, for example, poke its eyes out with a stick, if he were feeling threatened or in danger, the dangerous dogs act would doubtless accept this as a suitable self-defence. and police would not prosecute. you may also be able to sell your story to the daily mail and get £250 if they are convicted.
also consider that dogs can have diseases, including, for example, rabies. your bitten husband should make sure all his injections (TB etc.) are up to date. has he had a blood test since the last bite? And maybe you should avoid all types of intimacy with your husband until he has a blood test?
best of luck with this one but i think you really need to act.
Sloane Donkey