Riding Dog & Summon Monster I

[Jack of Tales]

I know this has been asked before, but the answer I read wasn't as clear as I would have liked.

It looks like in alpha/beta the SMI list included Riding dog which was changed to dog which was changed back to riding dog.

I've heard someone mention that it should have been dog and there is official errata for it being a dog instead of riding dog. I'd like to know which is the correct monster for the list. At the moment my DM and I are running it as a dog rather than riding dog, leaving much weaker options for combat.

[David Thomassen]

Summon Monster I In the PRD has Riding Dog, with Summon Nature's Ally getting the Dog. None of the errata give Summon Monster the Dog (All of them give Summon Nature's Ally a change from Riding Dog back to Dog).
So you are correct in using the Riding Dog for the Summon Monster I