I had a dog that was Rott/Aussie Shepard...

she looks a lot like Tilly did...except Tilly was black with brown and white...(aussie colored...) and the rottie eyebrow marks and size...

that dog is definitely part Rott...as for the other part...either a shepard or a hound...(the ears are pretty floppy...so I'd say hound...thats probably why shes not huge either...)..

Tilly was huge...90/100 pounds...and her ears werent that floppy..actually one totally stood up...and the other just the corner of it flopped over..

by the coloring...it could be a basset hound and rottie...