I have a Weimaraner. She will be 2yrs old in May 2009. I feed her Canidae all life stages for about a year without any issues or complaints.  Then in Aug 2008 I noticed the color of the bites of Canidae looked lighter. At the same time, Miley started scratching (to the point of hair loss)  Biting all 4 paws raw. Her ears got red and swelled. Bloody Vomit twice. Sores in her mouth (My Vet said the sores looked like she got into rat poisoning). After about $500 or more in vet bills and 3 months later, we switched her food. She is doing great and has stayed away from the Vet. We could not figure out what it was and boiled it down to, (She must have a grass allergy?) We don't have rat poisoning around the yard or house and when she goes outside we went with her. After switching her food and taking her off the Canidae, she is better. Now it all makes since that the new formula has caused it ALL.