I have this too.. and I've researched it.. and I believe it's fear too.. fear causes aggression.. but they say Don't pick them up, that's rewarding them.. yeah HOW do you NOT do that.. this one book says .. let them work it out. they have to find their own place in the pack... yeah right..
Bailey acts like this too any dog BIGGER than him.
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Rhonda, Bailey, Josie and my angel Bella Rue'
"Until one has loved an animal, a part of one's soul remains unawakened."
~Anatole France~