Thank you for all the replies.

letiole, I was on Calle Larga S Lorenzo but did not see cats.

The areas I checked:

Campo Santa Maria Formosa
Campo S Moise
Campo S Fantin
Campo Del Traghetto
Campo Pisani
Campo Santo Stefano
Campo S Maurizio
Campo S Vidal
Campo D Carita
Campo Calbo
Campo San Vio
Campo S Agnese
Campo D Salute
Campo S Bartolomeo
Campo Fava
Corte Teatro
Corte Barozzi
Campo san Polo
Campo S Toma
Campo Dei Frari
Campo D Tolentini
Campo San Barnaba
Campo Santa Margherita
Campo San Pantalon
Campiello Mosca
Campo San Rocco
Corte Gallo
Corte Spiriti
Campo Della Pescaria
Campo C Battisti
Campo Giacomo Di Rialto
Campo Rialto Nuovo
Campo S Fosca
Campo D Maddalena
Campo S Marcuola
Campiello S Leonardo
Campo Ghetto Nuovo
Corte Scala Matta
Campiello Dell Anconeta
Corte Lezze
Corte D Vitelli
and all the streets that connect them all

And of course, the major areas

Piazza Roma
Piazzale San Marco
Rialto Bridge area
Train Station area

I looked from 6am to midnight. I even looked for the house that someone told me was inherited by cats. Well, I guess the next trip...

Linda