Hazel, I never had any trouble feeding extra pumpkin, Mollys usual was probably close to 3 tblsps .. I gave her two heaping spoons full, one in am, one in pm. Maybe just gradually increase?
I gave to Molly for the opposite reason though, trying to firm things up.
A bit of ground flax seed or even flax oil might work too... just a little at time though, it's VERY effective
Magnolia (aka Nolie) - 6 yrs old, adopted May 3, 2009 - mixed breed monster mutt
R.I.P. Chloe - my first Golden girl - we said goodbye but you will always be here (1994-2007 adopted April 2000)
R.I.P. Molly - my Golden girl, who's causing havoc over the bridge now - (1999-2009 adopted May 2007)
and love for my "lost ones" - Misery, Clover & the girls (chickens)