| While bitches might become somewhat affected by seasons, this is way beyond normal or acceptable. If it were the norm, there would not be a living breathing intact bitch in the country.
Get a muzzle, put it on her and remove the harness. Then start using a collar. Harnesses are designed for pulling - carts, tracking, etc., but not for obedient leash work.
There are too many truly good dogs out there who need homes to be providing shelter to a nasty dog and you need to consider that as well. Is the shelter paying for the spay? They certainly should since they mislead you. They also have a heavy responsibility for adopting out a dog that has aggression issues. You should let them know what is going on.
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"The scientific name for an animal that doesn't either run from or fight its enemies is lunch."-Michael Friedman |