The vet clinic I use, Blanco y *****, has a branch in Cabo San Lucas at Narciso Mendoza #2918 entre Revolución y Carranza, Col. Benito Juárez. Phone there is (624) 143-13-70, according to the receipt. Their associated pet store, at least in La Paz, sells some types of Purina ProPlan, Eukanuba, etc. Not cheap. I recently paid 1,120 MXN for a 15 kg bag of ProPlan. There's also a Costco somewhere in Los Cabos where I'm told good dog products are available, though I've never shopped there.
Don't albinos have sensitive eyes and skin? Consult with your vet, of course, but the brilliant sun and intense summer heat of Baja California Sur could be a concern, as could allergies, insects, and various types of skin and ear fungus. Even my rescued La Paz street dog occasionally suffers from some of these conditions. Products are available and effective, but some may be too strong for your pups. As Gary mentioned, food may be the least of your worries.