This looks to me like a very pregnant harbor seal (Phoca vitulina richardsi). Its pupping season right now and I’m guessing that she (if she is indeed a she) is about to pop the pup. If in fact it’s really a he, then he’s a porker.
Pacific harbor seal.
Image ID: 20444
Species: Pacific harbor seal, Phoca vitulina richardsi
Location: La Jolla, California, USA
Asking someone if she is pregnant is never a good move.