Stalwart dogs, all. They would only have drowned if they had fought to the last breath.
Looks they were all terriers. *sob*
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.