I hope someone will answer this question please because I have the same problem.

Wow havent had any pets sinking into the floor instead I had my 2 alien colours dogs floating whilst their arms turned backwards.  Lol at first I thought is was an alien thing happening then the lightbulb came on (I am thick in the head sometimes)

Thankyou very much for these items, I perfer gothic in my game so this is really great.