"Kalbot" is correct, according to my mother that lived in Israel between -77 and -01.
כלבה is female dog and as far as I know a female dog in English is ❤❤❤❤❤ zo kalbot is not correct
Non native speaker here. The ב represents a 'b' or a 'v' sounds, depending. When the vowels are pointed, you can tell which it is. There are situations where the sounds will change from one to the other. The wiktionary page details the forms of the words for both masc:<pre>
However, I see now that wiktionary disagrees with the audio from duolingo here.
Duolingo audio: something like כַּלְבּוֹת
To confuse matters more, milog.co.il shows something different: https://milog.co.il/%D7%9B%D7%9C%D7%91/e_3195/%D7%9E%D7%99%D7%9C%D7%95%D7%9F-%D7%A2%D7%91%D7%A8%D7%99-%D7%A2%D7%91%D7%A8%D7%99
I suspect there's a bit of variation in spoken Hebrew on this word. I'd love to hear which pronunciation native speakers use.