RE- BOB MARTINS- as long as you use it correctly it should cause no problems. The issue happens when people use dog wormer on cats- happens frequestly when people are trying to cut corners and save money. The dog bob martins is extremely toxic to cats, has warnings all over the pack, and I have seen cats bought into the surgery within an hour of application having serious fits. Luckily the few i've seen did survive because they were bought in in time.

However bob martins is not a veterinary product and does not need to comply to the same regulations. It is therefore not as effective so combined with the risk of toxic poisoning it is best to use a veterinary wormer.

If you want a spot on treatment use one of the ones I suggested earlier which are all veterinary products.