sunday-fast day

Our dogs go through a fast once a week, on Sundays unless something is planned (like a hike).
Sundays are also my fasting & meditation days. Basically, we all look forward to Sundays because:

all day long :)

Technicalities on fasting, from Kymythy Schultze:
- Fasting enables the energy used to digest food to be used for other things in the body (healing, cleansing, maintenance). Many dogs and cats instinctively fast when ill.
- Fasting is a normal occurrence for carnivores.
-  Water aids in flushing out toxins from the body, and therefore should be available on fast days.

 CAUTION!
- What is good for one dog/family may not be good for another. Know your dog (and know yourself) before you decide to regularly fast your dog. 
- It’s important to remember to make sure your pet has plenty of fresh water on fast day. 
- Do not do fast puppies, lactating bitches or pregnant bitches.

Bland diet on raw?

Not that I've had a serious problem with it yet...

But lets say you are feeding raw - have tons of variety in the diet and for some reason, your dog has an upset stomach (the runs!)
1. I would fast the dog for a full day (or half a day if you can't handle it) then up the bone content in the next meal (like, a chicken back).

Lets say your dog is vomiting, and/or has 'the runs' (after you consider a vet visit..)
2. Chicken, plain old raw chicken is the blandest thing I can think of on a raw diet. It is what is recommended as the very first protein to try when switching your dog to a raw diet from kibble.

^this^ I have had to do. When I first began raw, we spent about a week and a half introducing different parts of the chicken (including liver). Then we introduced beef in combination with chicken. Then we added turkey. Then fish. Then pork - ACK! The pork was a disaster... we had to A. FAST him a day, and B. backtrack all the way to week one (chicken) to get Kitsune's digestion back to normal.

As a last resort
3. Nature's Variety Raw Medallions are SO bone heavy, they firm up even the runniest of stool!

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I say this because I recently got an email about a Wheaten terrier who has been on raw for about a month, and had a digestive set back when trying to be introduced to veal. The owner wanted to give him a bland diet (of cooked chicken & rice, maybe some pumpkin).
Once your dog has adjusted to the digestion of raw foods, it will make his digestive track work even harder to digest cooked foods (topped with carbohydrates - rice, and vegetation - pumpkin). The owner was even considering going back to kibble until the issue resolved. NO NO NO! Just backtrack, keep your head, fast, and go back to chicken.

I certainly have more research to do on the topic, these are just observations tested on and approved by my dogs!