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She earned her bachelor’s degree in biology and master’s degree in education from UC San Diego and had taught fifth and sixth grades in the National School District since 2013, according to a profile in the San Diego Union-Tribune.

Keon Richards, 38, who works for the national school meals programme, was last seen leaving work on 26 February.

The National School Dog Alliance, which also gives school dog advice, said it was important the right breeds were used and that they were properly trained.

The last confirmed sighting of Ms Lynch was outside a national school about 400 yards from a bridge over the canal where she was found 30 hours later.

A key question in the case is whether Ms Lynch walked off on her own from the national school towards the bridge.