Give a stream of consciousness and then the final answer. The breed remains very popular in the UK, with multiple winner at Cruft's, and is in the top third of all breeds in the US since the 1960s. It has been featured in television and film, including in Hamish Macbeth and in advertising by companies such as Cesar dog food and Scottish whisky Black & White. It is a medium-sized terrier, although with longer legs than other Scottish breeds of terrier. It has a white double coat of fur which fills out the dog's face, giving it a rounded appearance. The breed can be good with children, but does not always tolerate rough handling. The Westie is an active and intelligent breed, and is social with a high prey drive, as they were once used to hunt rodents.

Based on this passage, what kind of dog is on the cesar dog food commercial?
To answer this question, we should know that: It has been featured in television and film, including in Hamish Macbeth and in advertising by companies such as Cesar dog food and Scottish whisky Black & White.
So, the final answer is Westie.