Welcome to the forum, it is hard to let them play together when there is a big difference size.
I have 2 and at first when the older one would play I worried as there was a lot of holding down and rough play but then when the little one would keep going back for more I realised that she was loving the rough and tumble! But they are both small yorkies .
I'm sure someone with a perspective on larger dogs will give you some advice.
But if your unsure if he is getting hurt then I would be cautious .
__________________ From Julie Alfie & Lottie |