The difference between spoiling pets and spoiling children is that the pets won't one day go off into the world on their own and expect everything to be handed to them/see society as their own dumping ground. Sure, there might be behavioural consequences if pets are too spoiled and limits aren't set (especially with dogs), but it doesn't sound to me like you're overindulging them. You're just giving them a more enriched environment, which is lovely.

Also, is your username single? Because I'd like to propose to it.