My cats are indoor-outdoor cats. I know that's not popular with some, and I understand the arguments. However, I am wondering about flea and tick prevention. We use a topical treatment (advantage multi) in the summer and spring months. Once the cold weather hits (we live in Kansas...it gets bitterly cold in winter), we stop the treatments because the cats go outside far less. My question is...is it REALLY necessary to use the treatment every 30 days? We do it every 35-40 days and have never had fleas or ticks. I wonder how often every one treats their cats? If I can do it even less often, that'd be great. Money isn't the issue...I'll spend my entire savings to keep them healthy...but I just don't like putting it on them because of the horror stories I have read (I know...I shouldn't read Google). Thanks for any input!