I cannot see any problems at all with freezing the excess as long as it is done fairly promptly after opening the can. If you look into the canning process you will see the food is cooked in the can after sealing, meaning it is only cooked once and sterile... so there is no chance of bacteria multiplying if it's frozen after opening.

I am very fond of Asian cooking so I've done the same myself with unusual ingredients such as canned bamboo shoots, sliced lotus root, and water chestnuts - I never need a whole can-full in one recipe (and would work out far too expensive). It's lovely to be able to dip into the freezer for a few of those ingredients for a stir-fry!

Sometimes it does affect texture though depending on what it is - but I'm sure the cats won't mind. You would obviously need to make sure it is totally thawed and brought up to room temperature before serving though, as cats tend to refuse cold food (it's just not as smelly and enticing!).

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