I think Lilah does this more when she hasn't been excercised. She does have her favorite toys but based on behavior patterns I would say she dos this when she is under excercised. Maybe try to make sure pups are going on walks and getting enough stimulating playtime? It doesn't seem to be in Lilahs interest when she has already had plenty of activity to mount a toy.
__________________ Alyssa and Lilah    |