When it comes to hard-hitting journalism, many major outlets need to find a balance between serious stories and light ones, oftentimes called "human interest stories." Why? Because bumming people out with reality all of the time isn't really a cash-generating business model.
People want silliness and light-hearted, funny stories sometimes. Which puts some journalists and news anchors in a precarious position: They're forced to report on something they'd probably rather not.
And because most news anchors work in media, there's a certain level of entertainment and acting they're capable of in order to maintain their composure on air. Something that Simon McCoy was seemingly not interested in doing, at all, when he reported on a story about surfing dogs.