Only a few dogs are pictured. And 1 is obviously Bulldog (not any terrier in it), the other on blow-up is the Great Dane, and possibly the 1 nearest railing is a terrier, like a Jack or Fox type. But it could also be a Beagle or that type of small hound.
Since I wasn’t on the Titanic, and the photo is B&W, AND terriers were very popular at that time, I thought they could very well be terriers. The terrier is HUGH! An airedale is a terrier, even though it is a large dog.
But I’m not here to argue with you. Just make a few points.