let my start by saying you have a beautifull little pack, which seems to get alongnicely!
I think introducing a 3rd dog to your pack is not really easy.
My choise would be a bitch, simply becasue the fakt that a male in the pack might influence the current balance between your 2 bitches too much, my end up in a competition between the two of them.
I think however that both your dogs being so young, one barely adult, one still a puppy a lot might still change in your pack!
Did the 10 month old already had a heath period?
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