Boil the potatoes in unsalted water until tender. Let cool and then thoroughly mash them. Mix in ~1/4 of your parsley. The potatoes might be a bit dry but don't add anything to them.

Cook the peas according to the packaging.

In a large bowl, mix together the salmon, tuna, remaining parsley, chopped boiled eggs, and peas.

You can either mix in the potatoes or, as I did, serve the potatoes stacked on top of the fish mixture.

Form into patties appropriate to the size of your dog and serve!

Store the rest in the fridge for up to 3 days.