Margaret Clark 
Aussie Angels 7: Sheila the Heeler [EPUB ebook] 

Cattle dogs are extremely intelligent, love to work hard and are fiercely loyal. So when Ben, the old hermit who’s lived in the bush for years, suddenly vanishes, his blue heeler dog Sheila is very agitated, and comes to Animal Haven for help. When the Aussie Angels go back to the farm with her, there’s no one around. Can Meg and Mike help Sheila to find old Ben? They spot some new tyre tracks and one of the neighbours has seen a big black Mercedes headed for the farm. So who’s been visiting old Ben, and why has he disappeared without a trace? SHEILA THE HEELER is the seventh instalment in a series loved by children all over Australia.