ranger level -3 is the way to go in my opinion 
Along with asking the dm if there could be an item of slot X that would allow you to be treated as Y levels higher for animal companions. It would work for anyone with an animal companion.
Thinking about it further it could even work for familiars. So, to make it reasonable, it would be something like +y to level for druids and others with primary animal companions, +y-1 to those with secondary animal companions and +y-2 for those with familiars. I think it would work out pretty well.
Possibly 1,250*(+y)^2 with a max of +5? Half that price if placed in a whip or some other 'obedience trainer' (even a permanent salt lick or something) but only gains the bonus when held.
Just tossing out ideas
Which forum are we in again? lol

Along with asking the dm if there could be an item of slot X that would allow you to be treated as Y levels higher for animal companions. It would work for anyone with an animal companion.
Thinking about it further it could even work for familiars. So, to make it reasonable, it would be something like +y to level for druids and others with primary animal companions, +y-1 to those with secondary animal companions and +y-2 for those with familiars. I think it would work out pretty well.
Possibly 1,250*(+y)^2 with a max of +5? Half that price if placed in a whip or some other 'obedience trainer' (even a permanent salt lick or something) but only gains the bonus when held.
Just tossing out ideas
