No chart was posted and, it appears I'm the first to tackle this so, I made a chart for the time I came to understand your question. By the way you worded your question it appears you are asking for your friend. The posted chart below IS TURNED to show the 11th house AS THE ASC.
Right off the top, Saturn signifies the dog and is retrograd ein the 2nd which, is a fairly good indication of the return of the dog.
The Moon is strong and about to sextile Mars which, shows a neighbor may have it or seen it. The neighbor is to the South-south-east of her.
Mercury, the significator of your friend, is about to change signs, becoming combust, showing her distress but, also showing that somehow, rather the dog not being seen, she is hidden from the dog. I think she needs to make herself more visible in the neighborhood to the dog, post flyers and make even more of an effort to find it through exposure.
Is it an old dog, or what color is it? Let me just see if this chart is even describing the dog and situation before I look further.