A prong collar or illusion collar may work better becasue it controls more of the head of the dog and would be hard to chew through.
Also, when introducing the collar to him try to offer him a treat as well. Some older dogs are very skidish of collars if they have had a bad experince with them and that means they just bolt. Not fun at all being the handler in these situations. As soon as they run and you chase they are playing a game out of it and it reinforces this behaviour. So, best not to chase if she decides to bolt in the house. Try to give her a treat if she comes to you. That way it reinforces her coming to you.
You mentioned the harness being chewed through that must meam we are talking about an older dog with some jaw power - if so, I think a harness is the last thing you want to use. They can use all their strength to drag you around when wearing a harness. The two collars mentioned above will be more difficult. Also, you might just leave a short leash on her all the time in the house until she is better trained.
Also, when introducing the collar to him try to offer him a treat as well. Some older dogs are very skidish of collars if they have had a bad experince with them and that means they just bolt. Not fun at all being the handler in these situations. As soon as they run and you chase they are playing a game out of it and it reinforces this behaviour. So, best not to chase if she decides to bolt in the house. Try to give her a treat if she comes to you. That way it reinforces her coming to you.
You mentioned the harness being chewed through that must meam we are talking about an older dog with some jaw power - if so, I think a harness is the last thing you want to use. They can use all their strength to drag you around when wearing a harness. The two collars mentioned above will be more difficult. Also, you might just leave a short leash on her all the time in the house until she is better trained.