How to clean up Cat after they go out? and how to prevent flea?

My cat likes to go out every couple hours. I bought a colar , but he somehow get rid of the colar.  Then I bought Defense Care for flea for large cat drop, I put on his neck, I am not sure if that is good enough. And how to know there is a flea problem, if it happens.

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• 一个月用一次frontline就可以了。tick比较难搞，对人也很不好，我目前发现frontline +combo对flea和t -咪呜- ♂ (287 bytes) () 06/11/2016 postreply 03:33:29