7-8" is a LOT of poop! 3" seems more normal to me. But I read on a bag of dog food, can't remember the brand, that it said smaller poops from that brand bc they absorb more of the nutrients and there is less waste.
Maybe the new brand just suits your dog better than the old brand.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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