Miller, from Bradenton, Florida, has been charged with two counts of sexual activities involving animals after police discovered the vile images on her mobile phone.
Miller insisted she never forced the dog into any sexual act, adding that she never touched 2-face sexually.
The acts always took places when one of her family members was in the house, although they had no idea about what was going on in the bedroom, Miller said.
On at least two occasions, she took selfies. The 'puppy porn' pictures were discovered in two hidden folders on Miller's phone, one titled "2-face fun" and another titled "Me", police said.
Miller told officers that fewer than 10 of the acts occurred after she turned 18 in February.
A vet has indicated that 2-face showed no sign of injury when she checked her out.
Miller is due to appear in court next month.
Source: Smoking Gun