The pet product market online has grown billions of dollars over the last few years, so this is a great market to get into!
I'm happy you were able to find some products to sell already, but food is a bit of a different story. Because of all the different import laws between countries, any type of digestible products are not normally dropshipped. Suppliers could run into a lot of legal troubles and fines and so typically they simply do not offer it as an option.
Any type of food product is much more difficult to find for dropshipping. It's certainly possible and normal if you have a dedicated distributor, but not as single units being sold around the globe. I know this isn't ideal, but want to be transparent with you. For pet food, your best bet would be to look into a European distributor! Hope that helps.