help what would you do i mean this is my SISTER!

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ok so my sister has a dog we will call S and when i first moved up her i stayed with my sister for a few weeks till my place was avalible. she hardley fed the dog thn she would over feed it. the dog wasn't trained to go out side so she went on puppy pads. well my hubby and i went to get some of my stuff from her place and it was when she wasn't home and during a time where she said she had no money but bought new furniture and books and other non needed stuff. she we went to the house and S was SO SKINNY you could tell she hadn't eaten in forever. so we decided to feed her but there was no dog food in the house so we feed her what we could find a few dog bones and lots of bread and some fruit. on top of that the house SMELLED she hadn'e picked up S's dog poops and pee in over a weeks it was all over th house! i don't know how she lived like that but it was gross. it ruined a few peices of my furniture that she still hasn't replaced. the dog is now healthy and clean from what we see but i was ondering if i should call animal control this time b/c it looks like it is happening again.