Sardine cake-blitz a tin of sardines in tomato with one egg (clove of garlic optional) in a blender. In a mixing bowl mix in a enough flour to make a cake like batter. Spread onto a baking tray and put into a low oven until firm. Chop into finger nail sized pieces. Can be frozen.
I've just made some really easy ones from a recipe on a Facebook page. 1 large jar of baby food (sweet or savoury, no onions) and flour, recipe said 300g but I think I used about 250g and also added a large spoonful of peanut butter. Cooked for about 15 minutes then turned oven off and left them till cool so they are nice and crunchy. I didn't have a shaped cutter so used a water bottle top - just the right size. They seem very bland to me (yes I tried one) but DDog goes nuts for them! I can't give her anything with liver as her breed has problems with it (Dalmatian) and I like to know what is in her treats as some commercial ones can make her a bit hyper. I used an apple flavour but might try a roast dinner one next