Thank you both.

And, good point, Labhrás, about there’s only one dog in dog collars.

I didn’t think of that.
In researching today, I found that the Caighdeán Oifigiúil does explicitly state not to lenite a noun that’s a living thing (or part of a living thing) after masculine nouns on slender consonants, and A Grammar of Modern Irish by Pól Ó Murchú seems to imply the same, so I definitely feel more confident about that aspect.
But in my research, I accidentally dug up a different (semi-unrelated) question.

…
The Caighdeán Oifigiúil states: “Ní shéimhítear an dara hainmfhocal más sa ghinideach iolra atá sé.” (“The second noun is not lenited if it is in the
plural genitive.”) … It states that as a lenition exception after both the rule about leniting the genitive after singular fem. nouns, and after the rule about leniting the genitive after masculine nouns on slender consonants…but…
In both “A Grammar of Modern Irish” and
http://www.nualeargais.ie/gnag/gramadac.htm , no such exception is mentioned…as a matter of fact, on Nualeargais, they even give a couple of examples in the section on lenition of genitives that appear to outright break that “rule” (like punt
phrátaí )..”prátaí” is in the plural genitive.
So, do either of you (or anyone else) know which is more acceptable/“correct” when it comes to Standard Irish? For example, would “ an tsailéid phrátaí ” (of the potato salad) be correct? Thank you! I’m working on a larger project about lenition, and I want to make sure I understand.