As far as the statistical increase in reporting goes, it's quite possible complaints increased for a different reason, i.e. owners are finally making the correlation between their pet's illness and the food OR they are making a false correlation. Stats are a funny thing and that can be presented in a way to serve the presenters purpose.
Any entity that prepares food is bound to run into issues-think of all the beef and produce recalls for e. coli. Best thing to take away from all of this is no one is exempt despite their name or reputation. Also keep in mind that article is 5 months old-issues from that long ago may well be resolved.