Not exactly what I had in mind, but I think that yours is an interesting idea, aj0413! You are right that this spell needs to be balanced carefully.
When my proposed spell is cast on an animal, there could be two possible outcomes. Either there is a text "bubble" above them, saying that they are too angry with the player to even initiate conversation, or they become passive for the rest of the battle. If they became passive, and the combat ends, they are available for conversation. However, if the conversation goes south, it could lead to another combat. I was thinking that this spell would "nudge" the animals' mood a little, so that Pet Pal could be potentially used.
Maybe, if another version of the spell is used which requires a source point, it would "mind rape" the creature so that they would be always ecstatic to see the player. However, the ability to complete quests should always come first, so I think that these spells should be limited where necessary.
I was thinking that either a spell tome could teach this spell, or a second tier Pet Pal ability.
Thank you for contributing, aj0413! You raised some important concerns.