I think Hilton had a dog too.
Hilton did indeed. Meredith and Hilton were observed letting their dogs play together -- it may be how he approached her, like Ted Bundy and his fake cast.
The dog also played a role in Hilton's identification. At least one of the hikers who saw Meredith and Hilton together described the dogs and remembered the name of Hilton's dog. Once the description of the man and dog, and the dog's name, were announced, tipsters quickly gave police Hilton's name.