I use it sparingly as a treat and my mice love it. I dip a cheerio in it and they come over to grab it from my hand and run off to hid and munch it privately. I use the reduced fat kind. Peanut butter has a lot of fat and sugar typically (If you don't make it yourself) but it also has a good amount of protein. I think some mice are allergic to peanuts and can get skin problems and older mice can have kidney issues if they get too much protein.
I get out of date chocs from my job,lots of choc and the mice get it all apart from the ones I eat.I put a full bar per cage and it makes me laugh to see all the multiple teeth marks.They don't like the honeycomb in the middle of crunchies.
Feeding peanut butter by itself can be dangerous because of the risk of choking. You can dilute peanut butter with water and spread thinly on a piece of bread or cracker to be more safe.
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