Adopt them from the pound or buy them cheap IF they can do quests.
So a pure black puma, white symurgh, blue symurgh, puma with gracefulness, etc etc.
Keep an eye on the quests you get and try to get a pet each day that'll fulfil a quest.
This is how you start earning enough money to feed your pets and make a profit on the side.
With the extra silver you can buy building blueprints like for your Warehouse and Stable (buy from the item trades, it's wayyyyy cheaper) and you can buy better pets and you can afford breeding fees.
It's better to save up and buy gp3 pets and breed from them. Levelling up weak pets is expensive and time consuming. But once you have bred or bought pets with excellent genes and stats, levelling them up is easy.
Whoever calls on the name of the Lord shall be saved.
Random acts of senseless kindness.