Turns out Ein has been .... canoodling .... with the neighbor's Shiba while I'm at work. Long story short, I have an angry neighbor and there are gonna be adorable Corgi/Shiba puppies in the future.
Seriously, I always wondered why he never seemed to be very aggressive like his vet told me he would be if I didn't neuter him. Guess I have my answer now. I'm gonna take him next week and see about doing it. I hate to do it, but I guess it's necessary.
And yeah, I know, shame on me for not doing it when he was a puppy.