Sixto Almeda Carlos y Nepomuceno was born in Biñan, Laguna. His father with the same name was from Biñan, Laguna and his mother from Binondo, Manila. He established a Dog and Cat Clinic in 1927 and had his family home above the clinic; so much so that he was checking his patient (dogs and cats) as early as 4:00 AM. He was also active as a horse practi-tioner in San Lazaro and later in Sta. Ana. He was a stewart in the horse races. He was also well known by kutseros (calesa or caritella horse drivers) when services for free every Tuesdays. Being a devotee of the Black Nazarene in Quiapo, he reli-giously participated in the procession. He was registered in the government regulating office in the registration with number 057.

In 1918 together with Dr. Victor Abreu Buencamino, he is the first Filipino of-ficer of the PVMA in 1918 to 1919 as treasurer and Dr. Beuncamino as presi-dent while other officers being Ameri-cans.

In 1958, his son Dr. Enrique Rodriguez Carlos took over the Dog and Cat Hospi-tal in the same building in 185 Marquez de Comillas and later renamed 839 Romualdez St. . This was the first dog and cat hospital in Manila.

Dr. Sixto Almeda Carlos was also a Philippine delegate in the 1948 London Olympics. A great grandson, Rodolfo Sebastian S. Carlos was one of the torch bearers from among the 8,000 of the 2012 London Olympics. The Carlos family have been offering services to dog and cat companion animals. Currently, Dr. Sixto Enrique Miguel Alimudin Carlos y Siap-no continues the small animal practice in the Makati Dog and Cat Hospital.

Dr. Enrique T. Carlos