Diamond has not bought out Canidae, however Canidae is now outsourcing manufacturing to Diamond, so Canidae is now being manufactured in Diamond's facilities.

Canidae has also recently changed their ingredients and there have been a lot of complaints of vomiting and diarrhea from the new formula.

A statement from Canidae in response to complaints can be found here: http://www.consumeraffairs.com/pets/canidae.html