I myself would not feed wet dog or cat food to any medium or large monitor's, in the wild they eat reptiles-mammals-birds as well as dead carrion.
ln captivity you should feed them mice-rats and kangaroo mince or chopped up rabbit, this should give then a variety and plenty of calcium that they need to live a healthy life.
Remember to not over feed them cause it can lead to liver and overweight problems.
Small monitor's, should be feed a variety or insects such as, crickets-woodies-grasshoppers and newborn mice or newborn rats.
Small monitor's enjoy eating insects more and a little bit of meat occasionally.
l myself have kept ( Ridge-Tailed & Pygmy-Mulga & Spencer & Sand Monitor's), so l do know a lot about keeping and feeding and health issues, for when it comes to keeping these awesome lizards.