A video featuring a dog dressed in a spider costume has been named as the top trending video on YouTube this year. Mutant Giant Spider Dog has been viewed more than 114 million times. And bosses at YouTube have named it as their top trending video of the year, based on views, shares, comments, likes and more. Interestingly, the now famous iPhone 6 Plus Bend Test video is in at number 5. It has had more than 59 million views. You can see…