Mighty sollux aka Beau

Dutchy

Hi all, question our Beau is now 6 months and fine but we noticed a stop to gaining weight in past few weeks he was 16.6 and now he’s down to 15.3 kg. He’s healthy nothing wrong with him he runs plays and is his normal self only his meals are not that interesting it seems, tried all tricks in book but not working( extra’s as red meat raw eggs mixed with his kibble ect.
Is this normal for his age or am I fuzzy, thanks to you who respond :-h