Adopted Mango (3-year-old Pit Bull mix) 5 weeks ago. He's never been crate trained. When we first tried putting him in, he panicked — panting, scratching, full meltdown. We backed off immediately.
We've been working slowly since: door open, treats tossed inside, feeding meals near the crate. He'll now eat inside with the door open and seems relaxed in there. But the second we close the door he panics again.
Is 3 years old too old to crate train? Should we keep going with this approach or try something different?