I tend to use frontline But i HAVE to use a flea collar also with our youngest cat because frontline doesnt do a good enough job with him.

He had really bad fleas last yr because of going to and fro to the vets twice a week for 9months thankfully now hes home its got better and just front line will do the job!

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Owner to-
lots of rodents
2 monster dogs
1 slinky cat