Another day another swim

he does not like baths.

Can anyone explain why dogs don't just step aside (perpendicularly) to get out of your way rather than looking at you and backing up along the very path you are taking (did I explain that well enough)? The title is rhetorical since every dog I've ever had did this. I just want to know WHY.

Any one seen anything like this before? Back story, about three weeks ago my pup had a lump right in the middle under his jaw. I gave antibiotics and it mostly went away. Then like two days later he got in a scuffle with my other dog and got some sort of puncture wound to the mouth. The I found...