Please stick to the question. I’m asking if it is safe to replace it, not if you think they are a waste of money.
At the moment I don’t have the money to get something better from a vet, so that’s not really an option. The fleas were making him sick, so I had to try something, and he did improve after getting the collar, so it must have worked some. As for following instructions, I don’t think it said one way or the other.
Percy: You have it wrong. That was to the first person who didn’t say if they thought it was safe or not, but only that they didn’t think they worked. That wasn’t answering the question. I don’t have a problem with people saying if they think they are not safe (that goes along with the question, duh), as long as they aren’t doing it in a rude way (example: YOU). No, the collar did not make the cat sick. It was sick BEFORE the collar, and better with fewer fleas AFTER. I can trust my eyes. Obviously it did work. I’ve used them before (and no I’m not a monster for it) and they helped (without deaths or illness). But again, that wasn’t really my question, so I don’t feel like getting in a debate about it.