If your dog has or had ticks and you are concerned for the health of your dog, please contact a vet immediately. (gatehousevets.com)
Please contact your vet for a recommendation for other pets. (catspride.com)
Because the medication will have some residual action if the dog has an overdose then contact the vet as you would for an in - date medication and proceed accordingly. (dogs.lovetoknow.com)