young b/w puppy of 5 months is going slightly red under armpits and inside back legs all this on white fur no rash or sores
Am i feeding too much raw meat to cause this?

What makes you think it is diet related?

Is the pup fully on raw ? feeding  raw meat wont  cause this although I am not sure what you mean by too much. however if there is intolerance or allergy to any of the proteins you are feeding it  may do but more likely to affect the skin rather than the fur only. Also does the dog chew itself at all ? That can cause reddening of fur .Are you feeding veg ?
If so I would cut that out and see what happens.

My thoughts would be that the pup is getting hot and sweaty in these sensitive areas where the legs lie up against the body skin, you could try washing and drying very carefully and maybe put a small amount of vaseline on the red places

Just to throw in another possibility - is your dog a male that could be peeing on himself as he learns to cock his leg?

Other possibilities are: the water (try filtered); seasonal and other environmental allergies - pollens, dust mites etc; diet- carbs (including veg) or one, or more proteins. 

I am also confused by what you mean by "too much raw".  If you're feeding a mix of both raw & kibble/processed wet food I strongly suggest you stick to just raw as, if it is diet related, it's easier to control raw feeding ingredients.

Smile - this is unfortunately an often-seen condition in my main breed - in the groin area too.    Right now my boy is looking bad despite my trying to wash the areas.   It can be a yeast problem.

I have seen yeast problems in my big breed but in that case is was a grey skin colour and a "mousy" smell and only in an adult older dog, can puppies get it Mamabas?

More.common in adults but yes puppies could get yeast problems .that was one reason I suggested not feeding fruit or veg . I would try bathing areas in bicarb or Epsom salts or dilute avc that can help

My boy used to nibble the crook of his front legs and chew his toes making the fur red (hes white all over) I found it was feeding him minced beef that caused it. Hes fine with dried beef heart, liver as treats. I tried him with beef as main protein again only the other week and it only took a day of beef mince and he was nibbling again.

Sounds like an intolerance  to beef.might be worth the op hAvington  a look at the proteins she feeds .mine can't have chIcken or we get skin problems.can't tell if their fur changes colour as bother are black