if u need help here's a walkthrough!
Viewing post in Purrfect Apawcalypse: Purrgatory Furever comments
I noticed that if I follow the Chapter 1 portion of the walkthrough exactly as listed, I get Sparky and Angel to full heart and Brownie to one less when it says it should be Angel and Brownie full heart and Sparky one less. (This is an issue, as you get later chances to increase Sparky's hearts, but not Brownie's, nor do you get another opportunity with Angel that doesn't cause problems) I found that if I just talked to Sparky before coming back and recruiting him with Brownie and Angel in tow, to avoid the scene between him and Brownie, I got all three to full at that point.