Is it possible for a dog to catch a cold? I have been reading and getting conflicting information. I took my 8 month old puppy Spinelli to the vet yesterday and he put her on amoxicillin and cough tablets for 2x7 days. She really does not have a cough but she is very congested and has green mucous running from her nose. She is eating, drinking, and is still very playful but is having a hard time breating out of her nose.