Our cat was once sick on our new carpet. I don't know what he'd been eating but it left a large orange stain. Like you I tried everything but the stain persisted. Eventually I got a carpet cleaning company in. The man was very helpful and told me that I'd done everything wrong! However, with his magic system he completely removed all traces of the mark. It cost about £20 at the time. He usually cleans whole carpets but we only needed that little bit hence the low cost.
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Was the carpet dark and patterned originally, Bagatelle, or is that as a result of those generations of dogs, cats and children? 
You don't know them!!
And didn't hear what she said when I washed her dog's paws.
Anyway, they do have all hard floors.
On a lighter note:
Although my mother kept (and still keeps) her house spotless, she has never expected anyone to remove clean shoes in the house.
However, when I was in my teens we got a dog, a predominantly white collie cross,
and once or twice, when she was particularly dirty after winter walks in the muddy woods, we did rinse her feet in a bucket of water before going into the house.
One day, after another walk, she must have decided that her feet were dirty enough to need a wash, even though we hadn't rinsed them, because as soon as we walked into the kitchen, she went over to her water bowl and rinsed both front feet in it, one after the other!
Anyone else owned a house-proud dog?
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