I agree with 14+.
Did something startle him awake to make him attack? It almost seems like he had redirected aggression as 14+ stated, which normally occurs when a cat will see another cat outside and can't get out to fight so it attacks the closest thing, human or animal. One of our senior members has a cat with this and uses Feliway which I believe works for her.
First step is neutering to get rid of the hormones, and hopefully bloodwork will precede the operation. You many want to add a urinalysis to check glucose levels.
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Cat maid to:
Rose semi feral, a cpietra rescue, female tabby (approx 13 yrs)
Jasper RIP (2001-2018)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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