I have a very very dominant 80 lb F dobie, who is completeley submissive to an 18 pound cocker. She(the dobie) is totally dominant over a 70 lb male dobie, is this the order I wanted ..............nope. Is it working for them? Yep, so it works for me. Granted it is a bit humorus to see my cocker take what she wants from both dobies, and trot to the best seat in the house to enjoy it. However, they have no issues with it. Both the dobies joined our house full grown btw.

Leave it be and be aware if there becomes an issue (physically), other than that , enjoy watching them grow and learn together. Mentally and physically.