"Lazarus Lazaridis' personal blog with posts mostly related to programming and opensource. And cats." I agree completely that "cutesy" things don't belong in professional contexts (I like to make sensible exceptions occasionally to reassure everyone that I am, in fact, human), but these are his critters, so he is entitled to subject his readers to them (just like someone who posts pictures of their happy-smiley family). Also, you should be more concerned about humans, who carry parasites and bacteria (and viruses!) which are vastly more dangerous to you. :)

Although I vehemently disagree with you about cats, I feel pretty much the same way about the stupid dog gifs that my boss insists on putting at the top of our monthly report drafts, so I can see where you're coming from.

The thing is, it's not an actual cat/dog. It's not going to get dander or slobber or parasites on you. I just scroll past and forget about it.