@Tomkitten,
Dogs, cats will always ask for more food, they prey on us feeling guilty..
Getting them into a routine, such as a specified amount in the morning and same at night with zero snacks teach them that's their routine and honestly they are happy... It's us when they do their google eyes at us, when we eat or got to the fridge that makes us "feel" they are hungry, it's not so.
I have a Diabetic Dog, Husky 6am food and insulin same at night, stuffs my life up but she's worth it:) She used to get snacks or part of my meal, she doesn't look for it now at all.
I HATE pet food... I really do, google them, alot have so many chemicals and fat in them.
Lean mince or chicken breast, en-riched pasta, kidney beens, broccoli and carrot chopped made into a log, lasts along time isn't expensive and gives the shiny coat as well as carps, protein to keep them full...
Please google tin food... it's such a con in my opinion.. .Even a Diabetic Dog got the approval of this diet as just as good as the can food, although they haven't read what I read, regarding what else is in those cans.
Also fish oil, a teaspoon over the food is really good for the dogs/cats.
It's a pain to do but it's worth it for your pet...