HOUSTON -- A Houston mother told police that the family Dachshund bit off her 5-week-old son's genitals while she was sleeping, but investigators said they are skeptical of the mother's claims.

Houston TV station KPRC reported that the baby was rushed to Children's Memorial Hermann Hospital on Tuesday after he was injured at The Huntley apartment complex.

"She said she woke up to hear the baby's cries and found the family pet standing over the boy," Estella Olguin, Child Protective Services, told KPRC. "She said the dog had been the one to bite the child's genitals off."

"The injury that the child has is really not consistent with that of a dog bite or mauling," Olguin said. "We've never seen a case like this, when an animal is being blamed for mutilating a child's genitals."

The baby is in critical condition at the hospital, but Olguin said he is expected to survive. He will face many surgeries to treat internal injuries and help repair the wound, she said.

The baby's mother has talked to police and CPS investigators. She has not been implicated in any wrongdoing.

"We're looking into what could have caused these injuries and who could have caused these severe injuries to this baby," Olguin said.

CPS has taken emergency custody of the infant.

Houston Animal Control has taken possession of the dog.