Mine started flea meds at 4 months old. Thats when the vet started them. Heartworm also. You put it on before they get fleas as prevention. Some people dont like to use the chemicals on and only use flea meds when they need them so its up to you. I only put them on now when they have fleas. The heartworm you have to give every monthy though because heartworm is a deadly disease. |