Yes, his head definitely looks too long for a basenji. He has the colouring and markings that are consistent with a basenji though. My thoughts on the paralyzed leg are: as long as he doesn't drag it and it doesn't interfere with him, I would leave it. However, if it drags, you will want it removed as he will scrap the skin off and could get an infection. And, if it needs support, I would probably want to have it removed anyway as it is just in the way and may cause him issues. I would also go to a more specialized vet to see about the nerve damage, regular vets are fine for some things, but not for everything. Just MO