We have a 4 month old lab/border collie who won't eat her whole body is cold ex:( cept her head and she is puking up white foamy stuff it looks almost grey what could be wrong with her

we have a 4 month old lab/border collie who wont eat her whole body is cold ex:( cept her head and she is puking up white foamy stuff it looks almost grey what could be wrong with her
When you have a sick puppy you take it to the vet as soon as possible!

It is impossible for someone to diagnose your dog online. Anyone who tries will be doing your dog a grave disservice. When a puppy isn't eating and is vomiting, it is time to get it into the vet's office asap. I hope she is okay. Please let us know what happens.

You can check the sticky at https://www.askmehelpdesk.com/dogs/information-articles-our-dogs-expert-labman-53153.html#post254171
But with other symptoms besides not eating, just call the vet.