That is a very worrying video, if that dog snapped there is really little to nothing the owner could do and it could potentially result in an injured Guinea Pig if not a dead one.
A while ago, I took pictures of my Guinea Pig and Dog together then I thought about it if he did turn my Guinea Pig would be hurt or dead. There would be nothing I could do to get him off quick enough, so I quickly learned this was a very bad idea. Afterall I wouldn't leave him unsupervised with a child, so why let him near and Animal which his instincts are telling him to eat.
I'm very sure that people who leave there dog with a child don't expect it to turn it takes seconds and it happens frequently.
Sonia, I know this is a youtube video my comments aren't aimed directly at you, but I would hate for people to think this is a good idea. As I imagine Guinea Pigs are badly hurt or worse still killed by dogs daily. This of course isn't news, as it's only a Guinea Pig.
Please everyone think about it? Is it worth the risk?