I found this one on Etsy. The shop name is CraftsbyVita. If you search either the shop name or "chihuahua cross stitch pattern" in Etsy's search box, this one should be one of the first ones listed.

If you'd like to stitch a picture of the "real thing", send a photograph of one of your daughter's dogs to "Stitch a Photo" and they will make a chart for you. I sent in a picture of my daughter's cat and the cross-stitch picture is just perfect. You can find a picture of the ad at "Herrschners.com" online. The number of "Stitch a Photo" is AM181606 and the price is $19.99. You can read all the details in the ad. I just finished a picture of the building where my grandson will be married soon and it looks exactly like the photograph I sent in. Good luck with whatever you choose. I know your daughter will love it.