Since it is a Kali temple, animal sacrifice probably does take place there. Did Ramakrishna Paramahamsa sanction it? How about Vivekananda?
Yes, animal sactrifice used to take place at Dakshineswar Kali temple. Many evidences are there in Sri Sri Ramakrishna-leelaprasanga and Sri Sri Ramakrishna- Kathamrita.
Sri Ramakrishna approved the scriptural process of animal sacrifice wholeheartedly (Reference: Kathamrita,Akhanda Udbodhan Ed. page 144).However because of His own soft nature, He could not bear seeing it and came back to His room before the sacrifice was made.
Sri Ramakrishna left Dakshineswar in 1884. The animal sacrifice was stopped by the Temple Authorities in the 1950s so far as I know. The Yupakastha is still there.
(Reference: 1.Sri Sri Ramakrishna-Kathamrita, 2. Sri Sri Ramakrishna-Leeelaprasanga, Vol 1 & 2)