MSNBC's Mika Brzezinski Carefree Walking Her Dogs After Trump's Bashing

Mika Brzezinski has gone to the dogs -- in a good way -- after Donald Trump viciously attacked her.

The MSNBC anchor was out walking her 2 pooches Thursday in NYC ... with a curious letter emblazoned on her sweatshirt.

In case you've been under a rock all day ... Trump went on a tantrum Thursday morning, calling Mika stupid and crazy before saying she was "bleeding badly from a face-lift."

Mika was back to normal just a few hours later.