There’s a famous saying that goes, “Getting old is mandatory, but growing up is optional.” And it looks like some of our pets got wind of this too. So they decided to behave the same way as when they were still cute little furballs — from squeezing themselves into spaces they can’t fit anymore to holding on to their favorite toys.

Bright Side found then and now photos of animals who are so adorable, they’ll give you warm fuzzies regardless of how old they are.

1. “He may not fit in my hood anymore, but he’s still hitching a ride 3 years later!”

© CeeDot85 / reddit

2. “Arlo at 2 months and 8 months old, featuring his special toy”

© pureadobaby / reddit

3. “Loki thinks he’s water, and sometimes, I believe him.”

© Tristhar / reddit

4. “From 8 weeks to 10 months, still our little baby.”

© venusianpisces / reddit

5. “My cat as a kitten and as an adult”

© coatimundi01 / reddit

6. “I think her toy shrunk…”

© s_braat / reddit

7. “They couldn’t fit in this bed before, and they definitely don’t fit now.”

© elijaaaaah / reddit

8. “7 years later, he still gives headbutts when he wants kisses.”

© 2mgxan / reddit

9. “No longer small, but still needs love.”

© LizaDoMuch / reddit

10. Some things never change.

© SnooGrapes1977 / reddit

11. “My cats from 4 months to a year old — still avid tabletop gamers!”

© cervidaes / reddit

12. “From 2 months to 1.5 years old, still post-walk napping buddies.”

© Stumbling_Corgi / reddit

13. “Same as it ever was — my cats at 2 months old and 3 years old.”

© bluexwhales / reddit

14. “They still sleep the same way.”

© mamaneed-espresso / reddit, © scalpelChick93 / reddit

15. “He always had a lot to say (4 months vs 2 years).”

© 69NatalieMarie / reddit

16. “Here’s a 4-month-old Juno looking at a 12-month-old Juno. She always jumps on this bench on our favorite hiking trail.”

© Trailsend85 / reddit

17. “Once a mud puppy, always a mud puppy.”

© junoAndMe / reddit

18. “From a little 8-week-old kitten to a fully grown cat a year later. Still loves the lap snuggles.”

© myapurple / reddit

19. “Still cuddling with the same pillow.”

© Big_Tension / reddit

20. These adorable felines still cling to each other like they did as kittens.

© GoFundMeow / reddit

21. “I guess pets are never too big to be carried like a baby.”

© kissiwarrior / reddit

22. “He may be full-grown, but he still has the same mischievous personality!”

© hacknowledge / reddit

What are some of the amusing behaviors that your pet hasn’t seemed to outgrow?