The most standard sizes you'll find in cat food are:
* 3 oz: This is a very popular size for adult cats.
* 5.5 oz: This is another common size, often used for larger breeds.
* 3 oz (tray): These are typically found in pouches and may be slightly larger than a standard 3 oz can.
You may find some specialty brands or smaller brands that offer smaller sizes like 2 oz, but it's not a standard option. If you are looking for smaller portions, you can consider purchasing a larger can and dividing it into smaller meals.
If you have a specific need for a 1.5 oz size, you may want to contact the manufacturer or your local pet store to see if they offer this size.