occassionally my 6 mo. old kitten tyson makes these hacking noises... he'd sit still and his chest seems to move back and forth as he seems to try to hack out a hairball or something -- but nothing comes out. what is this? is it normal? some of my friends have mentioned that their cats do it too, but it's got me kinda worried 
any info that you could give me would be great... thanks guys
any info that you could give me would be great... thanks guys