No, cats should not eat lasagna because of the ingredients cooked with it.
Originating in Italy, lasagna is a baked dish that is made by stacking layers of wide pasta sheets and various fillings. Common fillings include cheese, tomato sauce, garlic, onion, and oregano—all of which are known to be harmful for cats. Because of these ingredients, it is not advisable to feed your cat the lasagna that you would prepare for yourself.
However, the pasta noodles used for making lasagna typically consist of flour, water, and eggs. These are all generally safe for your cat to eat. As long as the pasta sheet is cooked in water and devoid of seasonings (especially salt!), a few bite-sized pieces can be fed to your kitty without causing complications. Never give her raw pasta as it is difficult to eat and digest in its uncooked form.
What to do if your cat accidentally eats lasagna: Whether store-bought or homemade, find out the toppings used for the lasagna dish. Discover how much your cat ate, and update the veterinarian about your findings. Depending on the ingredients that make up the dish, your cat may suffer from any of the following symptoms: vomiting; diarrhea; incoordination; appetite loss; excessive thirst or urination; lethargy; blood in urine; weakness; high heart rate; panting; fever; skin discolouration; and stomach pain.
In summary: Cooked and unflavoured pasta sheets used to make lasagna may not harm your cat. However, the lasagna dish is another matter as it contains unhealthy toppings that can lead to gastrointestinal upset and other complications. Though the smell of this baked dish may entice your cat to ask for a bite, never allow her to try it.
Discover which human foods you can safely feed to your pet cat through our “can cats eat” blog category.