Ok, I understand that the base attack progression is the 3/4 progression displayed with 1 HD missing. But the saving throw progressions are weird. Are they following a formula, at all?
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Actually, the BAB is full, not 3/4. But notice their actual HD progression is not 1 to 1 with the summoner. Likewise, the saves follow the same progression of any base class, but it looks weird because their HD does not increase at each level.
So when the summoner is level 1, the pet has 2 HD, which gives it BAB of +2, and the saves of a second level character. And when the summoner is 20th, the pet has 17 HD, so BAB of +17, and the saves of a 17th level class.