It's highly recommended you ask your vet or vet tech. Every dog diet is very individualistic and it's important you know what your dog needs. Give the hospital a call!
I think the poop sample can be anytime . It's blue buffalo wet and dry feed him 1 can 2 times a day look at food chart for weight
My dogs don't get any dry or canned dog food. I feed raw chicken legs, raw port ribs and make fruit and veggie mix through my juicer then add yogurt Brewers yeast and raw egg at feeding. Read the book "Give your dog a bone" it is written by a Australian Vet that has dedicated his career to good nutrition for dogs! They are super healthy happy dogs!
I don't know I have cats lol
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