Doctor Dolittle (or Dr Doolittle) was a fictional character known for talking to animals.
When the Eighth Doctor said he spoke to Jamais, Guy Adams compared him to Dr Doolittle. (PROSE: Timeless)
When Fitz Kreiner spoke to Deel's escaped night beast, Trix MacMillan compared him to Doctor Dolittle. (PROSE: Halflife)
Trix, thinking the Doctor was talking to zoo animals, told him he wasn't Dr Doolittle. (PROSE: To the Slaughter)
On Sunday, the Tenth Doctor doubted he could use his psychic paper to convince pursuing otters that he was Doctor Dolittle. (PROSE: Wetworld)