|Clifford Gunther Howard|
|Age||10 (dog years) (Clifford the Big Red Dog)|
|Friends||T-Bone, Cleo and Mac.|
|First appearance||My Best Friend|
|Voiced by|| John Ritter (2000-2002 series)|
Bill Fagerbakke (barking) (2000-2002 series)
Adam Sanders (2019-present series)
Clifford is a helpful, outgoing and friendly dog. He will always help his buddies in their times of need and give them amazing friendly advice. However, he can also be gullible and naive and sometimes believes everything he is told.
Clifford was originally a small puppy, but is CURRENTLY a very big red dog, whose size sometimes gets him into trouble. He is sometimes tempted into trouble by his friends and those he meets. His size, like giants in medieval legends, is inconsistent—he is often shown as being about 25' tall from paws to head, but can appear far larger. Emily Elizabeth gave him a huge amount of love, which caused his big size. Clifford has a tag in Clifford's Really Big Movie.
- In the 1988 home video series and the 2019 series, Clifford can speak to Emily Elizabeth, but only when they're alone.
- Clifford was given a prequel series Clifford's Puppy Days that took place during his puppyhood prior to the Howards' move to Birdwell Island. In this series, Clifford is voiced by Lara Jill Miller.
- Ten (10) dog years are the same equivalent to seventy (70) human years.