If you pay attention, there may be some subtleties that might give you a clue. Dogs pay close attention to body language. He may see the Collies as a threat because of something not easily noticeable, and perhaps he is generalizing if one of them has given him bad vibes and the others look similar enough for him to consider them a threat. My boy really didn't like small white fluffy dogs, I have no idea why....but perhaps because many were noisy and wanted to get in his face.
Other breeds similar to Basenjis?
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Are there any other breeds that yodel like a Basenji? My dog supposedly has no B genes but he sounds exactly like this:
https://youtu.be/sQxY7AWF4O4 -
I can't listen to that, it would wake my girl up and well... I'm not into a "sing along" just now.
I will say that many canines howl and yodel and bay (at the moon, whenever a fire truck passes, etc.). I'm not certain that any one breed is distinctive enough to have a sound all their own, but many a proud owner would probably assert so.