Might take it a step further even: after the minimum of displaying petting needs, it'd be nice if some form of going the extra mile or automation could be implemented. The semi-daily petting needs are a big limitator on getting a lot of animals and/or making a business out of raising them.
Some thoughts:
- A brush to score extra affection points daily (equivalent in use/purpose to all the fertilizers available to plants)
- A ring or something else you can keep on you to create a friendship aura, generating the effect of petting if you're just near an animal.
- Capybaras to automate the effect of petting with the same friendship aura effect as the second point. Don't know whether these should live in the barns/coops or whether it should be a separate animal like the horse which home you need to strategically place.