Dog turning aggressive or less playful?

I have a lhasa poodle mix who’s around 2 and a black lab who’s barely one year old. they used to like playing and rolling around together. but in the last couple weeks my lhasa mix has been getting into fights instead of wanting to play with the younger dogs. what could be wrong? hes been fixed and hes never been... show more I have a lhasa poodle mix who’s around 2 and a black lab who’s barely one year old. they used to like playing and rolling around together. but in the last couple weeks my lhasa mix has been getting into fights instead of wanting to play with the younger dogs. what could be wrong? hes been fixed and hes never been aggressive like this to any of our dogs. could he just be older and less tolerant of playing?
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