As with all wildcards, you can specify more than one in the same search term.
The above search term will match text that has dog within 9 words of cat (8 intermediary words) and also horse within 9 words of dog. All three words must be present and in the order specified. An example match would be:
I own a cat called Fluffy and a dog called Rex but my favorite pet is my horse, Blossom.
Different categories of proximity wildcards can even be mixed in the same search term:
The above search term will find text with jim and sand in the same sentence, and sand and sea in the same paragraph, in that order. An example match would be:
Jim played all day in the sand. He only came in when the sea got too cold.