I'm a vegetarian (Alibet quiet new) and I keep my consumption of animal products fairly low. I don't think I would ever go vegan/ vegetarian for my dogs. However I am always willing to consider something before writing it off completly. I must admit I've never thought too much about changing my dogs diet. I assume you/ your girlfreind have done quiet a bit of research on the topic and would be interested to read any sites you may have found on the topic.