Carpet stain that just keeps getting bigger when cleaned?

One of our dogs puked on the carpet. Not a big deal. I cleaned it up but when it dried the whole area around the stain became discoloured and seemingly stained. I cleaned it and that stain became even bigger. I’ve steam cleaned it now and still no improvement. I’m afraid if I keep going with this I’ll end up with an even more massive stain than is there now.

I cleaned it up with a product called, Pink Solution which I have used for 15 years to clean carpets, furniture…well, actually, just about anything.

Does anyone have any tips on how I can get this stain up?