Why isn't my beloved cat a correct solution here?
It is - report it.
ok thank you
it happened to me too, I have reported to accept it (we all can improve Duo)
As if one could choose!
What's the difference between кот and кошка
Кот is specifically a male cat where as кошка is female cat but also the general word used for 'a cat'
"Favorite" was not an option.
Check: my beloved cat
Lovely - maybe less Shakespearean, but should be allowed?
How would one say: "My favorite is the cat", please?
Cамый любимый у меня - кот.
is it wrong 'my lovely cat'?
It is. Lovely≠beloved. Depending on the context, "lovely" can mean "nice", "attractive", "enjoyable". It is probably best translated to Russian as "милый" or "славный", but certainly not "любимый".
This drill looped 9 times. Why?
What's wrong with 'my lovely cat'?
In today's English, this would mean "my beautiful cat". In archaic English you would be correct in your translation but now 99% of native English speakers would misunderstand you.
Can we use this word to refer to bf like my lovely bf ?
EDIT: Tomcat is accepted, so maybe my English was wrong.
I typed "my favourite male cat" and it wasn't accepted. Sure, it might not sound completely natural in everyday conversation but it is more correct and specific than genderless "cat".