Interesting question and one I have not heard asked before. So pets and Alzheimer's disease (AD), they are usually are a good fit as people with AD usually love babies
Best wishes to you on this holiday season.
and pets. Right now however she doesn't understand that feeding a dog people food is not the best thing for the dog. so, you might try to store all food in cabinets with child locks. You might also have to separate them until this phase passes. Signs "do not feed the dog" may help some but with her short term memory loss this may not be effective. You will have to monitor when they are together until she no longer has the desire to feed the dog.