preparing bland diet for my dog?

Boiling the chicken is fine.

Another option is the cheap sandwich chicken roll from supermarkets.

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I do that all the time.

I put the rice in the pot for 20 minutes to boil, add frozen chicken breasts, and boil for another 25 minutes (I use regular rice, not instant, that takes 45 minutes to cook).

I then take the chicken out of the pot, run it through the food processor, add the rice to some of it, let it cool, and feed it to my dog.

I also make about 3 days' worth at a time and I just warm up the food in the microwave for about 30-45 seconds. For some reason my dog LOVES it a little warm.

Why would boiling chicken from frozen create more bacteria?

For sure you can do that. I cook chicken from frozen for myself all the time.

I boil chicken while its frozen all the time, once it starts boiling..reduce heat to a simmer and leave it for 20 minutes

Adding some salt helps kill off bacteria too

I'll be doing the same thing you are doing today myself, for one of my 3!! LOL

You are lucky it is just diarrhea my dog is going crazy and i dont know Why!

... you should d freeze the chicken before cook it.

Hey hey, The best success that I have ever had was with Marks magic method (just google it) Without a doubt the most helpful diet that I have ever tried.

Boiling it would kill any bacteria.