A DNA sample should have been taken from the carcasses. This will show whether the animal is a dog, a wolf, or a big cat, and will also be used to match to suspected killers.
Born in sheep country, I know very well that otherwise lovable, well-trained dogs can turn into sheep worriers and then have to be destroyed.
As we all know, keeping male dogs in your garden etc. when they catch the scent of a bitch in season is well-nigh impossible, but the owner is responsible if the dog goes on the rampage while loose.
Wolves do have paws about that size, but unless one has escaped from a zoo or animal park, it cannot be a wolf, surely.
Last time I checked both Britain and Ireland were islands, so how could a wolf get there? They cannot swim either the English channel or the Irish Sea, and assuredly not the North Sea.
Surely, it would be far-fetched to suggest that someone mistakenly smuggled a wolf- cub into the UK, thinking it was a German shepherd?
This has nothing to do with how well, or ill-trained the dog is, or restricted to any particular breed. Even sheep-dogs can turn into sheep-killers!
Certainly, if you live in sheep country, your dog should never be allowed to run loose, Naturally, it is the dog owner's responsibility to make sure this does not happen,