Gabe used to tell david, asher, milo, and Tank that he'd get them all neutered/spayed whenever they started acting up
''I'm proud of you, david''
''Keep your chin up, son.''
''You're my world, kid.''
''I'll always be right there with you, even if it doesn't feel like it.''
Gabe having a doorframe at the den that has markings of how tall Ash, Milo, and David grew. Higher up the frame you can see a new set of marks, labeled ‘Tank (age)’.