hmmm that is a hard call , I had a Pom and she walked right out of it so Im not sure. A Chihuahua and a pom is pretty much the same size except for the fur one the pom that I kept trimmed really short on mine.
The other thing as well is my pom hated to wear clothing. If you took some small pins and tacked it up in the leg area you would not have any issues at all,Also with her being tall that also helps to so she may fit in it! If she likes to wear clothing then you may not have a issue,My dog always found a way out!
IF SHE WEARS MED THEN YES BUT ISNT A THAT A BIG DOG? This is more for a sm to med dog that is why I posted a pic of my dog in it so people can compare.