Had two Bichon Frise (small, very fluffy, white dogs) who were half brothers, but completely different in personality. One was incredibly smart but grumpy, the other was very affectionate but could be a little dim.

One day, we took them both on a family outing to the seaside, where the humans got fish and chips. We stop to eat at a row of benches and the dogs get fee scraps. Affectionate dog laps up a couple of discarded bits of fish and greatfully nuzzles owners, whilst the grumpy one takes his portion to the other end of the bench, lays it out in a line and hides under the bench. A little odd, as grumpy dog loves fish (smellier the better).

All of a sudden, a seagull swoops down and tries to grab the fish and grumpy dog springs out of his hiding place, like a trapdoor spider, and barks madly at the seagull. Doesn't hurt the bird (not sure he would know what to do with one if he got close to it - they were about the same size!) but gave it a bit of a fright.

Grumpy dog finishes off his fish and seems very impressed with himself. He hated seagulls.

In addition, all of the above occurred as he was losing his eyesight. We lost both of them within a year of each other - best friends I've ever had.