My boy Sunny would howl on cue. We had a little "howling song" that we would sing, and that set him off. Also, the phrase "you're only a dog and that's all you'll ever be" would result in instant howling! And once started, he would continue. I have a video where I picked him up and held him upside down, and he continued to howl!
Your baby looks exactly like my "Harry" who I had to put down this past Monday. He had all characteristics of a Basenji, tho I am pretty sure he was a rat terrier/basenji mix. (I wrote about him a few years back on this link: https://basenjiforums.com/topic/15001/more-tales-about-harry-the-autistic-basenji-mix
We had him from about 8 weeks old until may 15th at 7:30 am.
What a crazy guy. Handsome as all get out. (I always told him that if there was such a magazine as "Handsome Dog magazine", he would be on every cover. I think the reason I am so heartbroken is that he was so hard to bond with and my wife and I took care of him almost like one takes care of an autistic child.
Well, I know this is 4 years late...but I am sorry for your loss and hope you found another like your beloved baby.
This is a pic of Harry after he lost over 20 lbs because of kidney disease.