Which could have been contracted from the hospital also, not necessarily the dog.
90% of us would test positive for MRSA. That means nothing. Rarely would it cause a problem until there is a wound or weakened immune system.
If you get a chance to attend a veterinary dermatology conference or lecture, MRSA is often a topic these days. Mostly because of the hype starting up and the need to reassure people chances of you getting MRSA in your hospital still outweighs that of your pet getting MRSA 1 million to one.