Some animals can be more difficult to swab than others and swabbing a cat can be more challenging than a dog. Usually the first swab is easier than the second as after the initial taste the animal can become resistant to the feel and taste of any second swab. Some suggestions are: Try to approach the animal with a level of calmness and from a less forceful manner. Perhaps do one swab at a time or offer a reward after the first swab, wait for 30 minutes and collect the second swab. If all else fails, consult a veterinarian about taking blood sample, as it never fails and ensures quality DNA!