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 I did try naming both collections the same thing, but it had no effect. The two collections remained separate despite having the same name.

When I select both collections and right-click, I don’t even see the “Merge …” menu item. It’s not grayed out; it’s just plain not there. (It is there when I select other pairs of collections, so I know it exists and works.) 
 @a6ff0b2b The only time that I had trouble is when I manually named a pet before this feature and so therefore Photos thought the pet was a person and would not let me combine it examples it found later as a “pet.” 
 @87efe010 I don’t think I did that, but at least it’s a plausible explanation! If I did do it, I wonder if I can undo it… 
 @a6ff0b2b Have you tried merging them in Photos on iOS? 
 @fec3e70a I have. It won’t let me do it there either. 
 @a6ff0b2b is there an equivalent of “Remove this Person” that you could use for the body? 
 @a6ff0b2b Is it only with pets? Just Daisy (and Daisy Mae?) What if it surfaces Daisy May? I’ve gone as far as creating a folder for the subject and naming the folder that name, which I highly doubt does a single thing. It’s the way superstitions form. 
 Turns out the issue is just as @8a54b27a (and others) described: https://mastodon.social/@ddlevine/111182827326542972

My“Daisy Mae Body” collection is a *person* collection, according to Photos, so it can’t be merged with a pet. @8a54b27a said he fixed this by deleting the “person” collection and then letting Photos do more analysis, resulting in a new “pet” collection which was then mergeable. 
 @a6ff0b2b Do you mind using the Feedback Assistant to report the issue? 
 @f89362b1 Now that I understand the issue, I’m not sure what the Feedback should say. Maybe just asking for an error message when trying to drag and drop a pet onto a person or vice versa? 
 @a6ff0b2b both issues: the dragging and the miscategorization of the pet body as human. 
 @f89362b1 Hah, OK, will do. 
 @f89362b1 FB13237070: Photos identifies my dog's body as a person

FB13237083: No error message when trying to merge a person and a pet in Photos 
 @a6ff0b2b Thank you!