If the companion is level -4 (to a minimum of 1)
You'd have to be 4th for that logic to work.
Unless you can take the talent only once, at say level 2 and have an animal with 1/2 HD?
Taking the talent a second time is a HD per your level.
Which seems to be working correctly, unless I misunderstand you.
Potentially in the first case, you should be able to take the talent only once and at level 2.
And still get a 1 HD companion, as the minimum is 1.
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