Hi,
As there is so little difference nutritionally between puppy/adult ND, you could always alternate the two for variety and he wouldnt be missing out on much at all. Perhaps feed a little more adult but I doubt that would be necessary.
Just another thought for you and your little one

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"Life is mostly froth and bubble, Two things stand like stone,
Kindness in another’s trouble, Courage in your own”

there is really very little difference in puppy/adult food when it comes to wet varieties iv found. usually only a 2/3% difference in protein. so i think you would be fine to feed teh adult varieties alongside his puppy dried food.
i took both my beagles off puppy food when they were 6months old.

i mainly feed arden grange dry. has always kept my dogs looking in tiptop condition. they also get naturediet on occasion.

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6th Jan 2008 - 22nd July 2009

Mine as pups from 8weeks just had normal adult nature diet but I only used the chicken variety as the others upset them.

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Our Precious Girls.