I was thinking the same thing about the toxins. Barret, the collie/terrier mix, has been on commercial dog food for 5-1/2 years and has gradually become less healthy over about the last 2 years. The JRT is not 3 yet, so maybe he didn't have a chance to start getting unhealthy yet. Hopefully I started the raw diet in time for him to stay healthy.I switched both my dogs cold turkey, and they didn't have a reaction. I would say that as far as the collie/terrier mix, it really depends on the dog, how much crap did he have in his system that needs to work it's way out. Was he on really bad food for a long period of his life, getting vaccines and flea treatments, if yes, then he's gonna have a reaction to real food. It's like flushing the system of toxins.
Actually all kibbles are basically alike. They all digest pretty much alike. Raw meat, bones, and organs take different enzymes to digest. Your dog's digestive system needs to start producing these enzymes pretty quickly. If you alternately throw in kibble and raw, you are just wrecking havoc on the digestive system.OK for those who know... here's another question... why do you have to slowly change from kibble to kibble and not from kibble to raw??? Logically it's a different food so why not?