ok Silico thats pretty difficult. Pretty difficult indeed. Pets. Aquariums. Clones. Wow. Fascinating. I'd say the dogs represent same situations day after day after day. Unable to tell one day from another. Dog Day afternoon. Dog day summers. (etc.) Then all the dogs die. Also you mentioned they were cloned. A situation that is the same the same the same the same. Probably ready to drive you nuts. Then you see the aquarium and its beauty. All the beautiful things in the water. A new situation but when you jump in everything is dead and doesnt look at all like you saw it in the beginning. A trick of somekind. Dont know if this helps.
Maybe someone tricked you into a new situation that was really worse then the first.