WillSimplyBe posted...This issue tends to pop up with that mangy little jerk, the stray dog. He's a random encounter that can appear at any time, and will automatically join you, whether you want him or not. Biggest problem is, he likes to get lost, or die or drop off the face of the planet once he's seen you. making it impossible to recruit a "pet" slot follower. What you're going to want to do is find Meeko in Meeko's shack, a ways east of dragonsbridge. He will auto-follow you, and stop the glitch. then you can dismiss him like any other follower, and voila, you can now recruit one of the armored trolls or awesome armored huskies.
addendum since i can't edit yet, The Stray Dog can show up and be completely unnoticed. You may have had him for a few minutes without even realizing it, and it simply wandered off and fell off the planet before you noticed him. It's AI is incredibly buggy, so bad that i immediately dismiss and kill him every time i see him...