Venice non-seafood Restaurants?

Most restaurants have several non-fish options.

La Zucca might interest you. Many vegetarian items. Otherwise, as mentioned, most menus have some meat or vegetarian options.

Over several days in Venice, we found enough small restaurants with pasta, pizza, and vegetable options to satisfy us (husband with celiac disease had no issues with the gluten-free choices). The front desk staff at our hotel were very helpful with nearby restaurant suggestions and many of the restaurants post their menus outside so you can have a look before entering.

Not fish eaters at all (and from the Maritimes!! My oh my)...but we never had any issues finding restaurants. I mean, we mostly subsist on pasta and pizza anyways, so that is always available. One we enjoyed was https://www.allamarone.com/ in the San Polo area - we stumbled upon it our last night and they are def on my return to list when we return to Venice. So if you are in the Rialto area, give them a look...

Ai Gondolieri in Dorsoduro is a very nice restaurant with nary a speck of seafood on the menu---the pastas and secondi have veal, lamb, beef, duck. . . Lots of choices.

http://www.aigondolieri.it/

If you are near Toletta / Riva dei Artisti, eat at "Ai Artisti".. wonderful handmade pasta dishes, not all with seafood. The waiters can be a little gruff and you'll hear them loudly comment on the females who walk by the premises, but the food was spectacular. http://www.enotecaartisti.com/gallery/