This Google map makes me think the perp grabbed Sierra from her home (or driveway), and discarded her stuff as they headed northbound on Hale/Santa Teresa. A>C>D>?
Google Map -
http://g.co/maps/76qtm
A) HOME-PAQUITA ESPANA COURT - Dog lost Sierra's scent at driveway.
Approximate drive or walk time from above address.
B) BUS STOP-PALM/DOUGHERTY AVE.
0.4 miles - Drive, 1 minute or 7 minute walk.
C) CELL PHONE (found 3/17) -SCHELLER AVE./SANTA TERESA BLVD.
0.8 miles, drive, 2 minutes or 16 minute walk.
D) PURSE/CLOTHES (found 3/18) - LAGUNA AVE.
1.8 miles, drive, 5 minutes or 34 minute walk.
One consideration... Maybe the perp got rid of the clothes at Laguna/Fisher because they stopped/turned there. Bailey would have been a much better road to turn if you were planning an escape or getaway---it leads to Highway 101. Turning/stopping on Laguna only makes me think the perp was staying in the area (at least temporarily).
There are waterways and fields all along Hale/Santa Teresa towards Bernal Ave.
I hope those have been searched thoroughly.
#findsierra
-JMO