Last year I adopted a brand new kitten. He is now 10 months. When he was 6 months, we took in a very calm, down to earth 8 year old cat to be a buddy for him. They play, wrestle, what have you, and have gotten along great. Until recently...
Since last month, my kitten has started having in explicable temper tantrums. I come home to find him growling and hissing constantly. He will bat at objects just laying around and back off expecting them to hit back. He does this with my foot, even when I'm trying to feed him. There's times where he won't let me pass in the hall. He turns around as if something has just pulled his tail, although it's obvious nothing has touched him. He'll get really irritated and down right screetch and howl at nothing. The older cat is as mellow as before.
Is this a territorial struggle between the two that's causing my kitten to do this? There's times he'll calm and just start up again. It's very unsettling. He's had all of his shots and is in completely good health. Both cats are. To me it sounds like there is a smell that just sets him off, but if this is the case, then why isn't the other cat like this?
Has he been fixed yet? If so, it could be he's just entering those terrible teen years. It's hard to pin point a behavior change if it's something unusual, especially as cats have a different range of senses from us (it would be more likely that a sound would cause this, something ultrasonic or subsonic, that a person couldn't hear).
Otherwise if the behavior is really extreme, I'd consider getting him checked. There are certain conditions that can cause behavioral changes.
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