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my vet is well aware you should not use ivermectin on collies, but I know a lot arnt - as it can be fatal for collies, I wonder how many use it on collie crosses though? Fortunately I know not to use anything with mectin in it - but the technicians at stronghold were trying to reassure me that selamectin which is in stronghold - was ok to use, but i am not going to risk it, as I know someone who's dog had a bad reaction, his skin thickened and was like glue. I think my puppy has rabbit mite, but i am treating it with seleen shampoo at the moment.