Why are you all sniffing cat urine any way. therre are 4 main reason why cat urine has such a strong odor.
1 cats dont sweat, hence more amonia comes out in there urine.
2 cats are indoor animals you will get to smell there urine.
3 As opposed to a dog that you walk outside so that they can do there stuff outside, you almost never get to smell there urine, so who is to say their urine is not worst.
4 dogs run around and drink more water, a more diluted amonia smelling urine out put.
# 4 applies to human too, the more water you drink the less amonia output in your urine.
Ammonia and traces of protein with a chemical call urea are the main culprit ,,,,,,,,not to change the topic big lover of cat here. they are cudly, ALWAYS clean and smell way better than dogs they are not nasty animals and definately quieter than dogs.