Poodle Mix Dog (Redding)

7 month border collie poodle mix puppy, free to good home.
He’s crate trained and have a crate to go with him if needed.
Great with dogs, cats and and young kids.
I just adopted this dog on a trial basis and owner is unavailable for me to return him (due to family emergency out of town) and my dog who is a three year old pit mix is not accepting him.
I feel so bad, he is such a great puppy.
My dog is just not accepting him here.
Looking to be adopted or foster home asap.