Everyone does this. Everyone. It’s so simple: if you’re the subject of the sentence, you’re ‘me’.
DH and I bought a chihuahua- correct
DCs and I took chihuahua for a walk - correct
The chihuahua barked at DH and I - WRONG
Please send the chihuahua back to DH and I - WRONG WRONG WRONG!
If in doubt, take out DH to hear how wrong it sounds:
Please send the chihuahua back to I.
The chihuahua barked at I.
Thank you 😥