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(1) Here, "only" is adverbial, so I would use только (or лишь would work here too, I think), and place it immediately before the direct-object phrase:

Кошка любит только мою сестру.
The cat...

D'oh!

But it seems to me that this is, possibly, an example similar to Его приняли в космонавты, isn't it? In other words, a very rare exception that foreigners can ignore until they're at the...

Yes, that's undoubtedly the meaning that dinlot intended.

Между прочим, моим пиндостанским ушам, "to give (someone) a prompt" чем-то звучит "слишком по-британски", а "to give (someone) a cue"...

Make a note of this, dinlot -- here's the entry for мой in Викисловарь, which you can find at ru.wiktionary.org. It includes the complete declension in all cases and genders, singular and plural!
...

Antonio, пёс is used when you want to particularly emphasize that your dog is "a boy"!

The word собака is grammatically feminine, but can be used either:
(a) about a female dog
or
(b) about a...