Canadian Tigers at the Washington conference

What if Canada refused to surrender four Tiger-class ships under a Washington-style treaty?

The treaty would need separate Dominion allowances or fail, because Britain would not force Canada or Australia to give up their ships and American attempts to treat them as separate powers would create an imperial crisis.

If Canada retained four Tigers, Australia might also refuse reductions, and the United States could not simply add those hulls to Britain's allocation without negotiation. Treating the Dominions as independent naval powers might appear arithmetically convenient but would collide with their imperial status. The likely settlement requires separate smaller allowances and larger totals for Britain, America, and Japan, or there is no treaty.