I don't know.
I do know that the young dogs that will bark and carry on in class when a dog gets too excited, are doing it out of insecurity. What your dog is doing may be out of insecurity, but it can also be resource guarding. He may see the new foster as not a pack member and is denying access to pack members.
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RIP Arwen, CD RN CGC 
RIP Whitney, RN CGC
Jenna, RN CGC & Babs, CD RA CGC HIC (not AKC)
Heidi, RA CGC & Tori, RN CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear
Gretta
Hepzibah
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