Dr. Seward keeps us apprised of his patient and things are getting more dangerous.
19 July.—We are progressing. My friend has now a whole colony of sparrows, and his flies and spiders are almost obliterated. When I came in he ran to me and said he wanted to ask me a great favour—a very, very great favour; and as he spoke he fawned on me like a dog. I asked him what it was, and he said, with a sort of rapture in his voice and bearing:—
“A kitten, a nice little, sleek playful kitten, that I can play with, and teach, and feed—and feed—and feed!” I was not unprepared for this request, for I had noticed how his pets went on increasing in size and vivacity, but I did not care that his pretty family of tame sparrows should be wiped out in the same manner as the flies and the spiders; so I said I would see about it, and asked him if he would not rather have a cat than a kitten. His eagerness betrayed him as he answered:—
“Oh, yes, I would like a cat! I only asked for a kitten lest you should refuse me a cat. No one would refuse me a kitten, would they?” I shook my head, and said that at present I feared it would not be possible, but that I would see about it. His face fell, and I could see a warning of danger in it, for there was a sudden fierce, sidelong look which meant killing. The man is an undeveloped homicidal maniac. I shall test him with his present craving and see how it will work out; then I shall know more.
10 p. m.—I have visited him again and found him sitting in a corner brooding. When I came in he threw himself on his knees before me and implored me to let him have a cat; that his salvation depended upon it. I was firm, however, and told him that he could not have it, whereupon he went without a word, and sat down, gnawing his fingers, in the corner where I had found him. I shall see him in the morning early.
Notes
Moon Phase: Waning Crescent
Renfield is progressing to larger and "higher" life-forms. Seward sees this as a progression towards homicidal mania, and he is not too far off, both in terms of the story and real-world psychology.
We know that many serial killers progress from harming animals to later humans. Not that all who harm animals will be serial killers, some are just assholes, but most serial killers start out this way.