Stop scooping, start training
Lifting a worried dog away from everything removes its chance to learn. Give distance instead, and reward the dog for choosing to look.
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Toy Group
The smallest breed, with none of the smallest attitudes. Most Chihuahua behaviour problems come from a world that is genuinely too big, plus a well-meaning habit of picking the dog up instead of teaching it.
What to work on first
Lifting a worried dog away from everything removes its chance to learn. Give distance instead, and reward the dog for choosing to look.
Teach a consent signal for being handled or lifted. Snapping in toy breeds is usually the last step after quieter signals were ignored.
Recall, loose lead, settle, and handling. Small size is not a reason to skip any of it.
Where it usually goes wrong
Behaviour that involves biting, real fear, or a sudden change in an adult dog is not a training problem until a vet has ruled out a medical one.
Recommended equipment
Chosen against the training plan above, not against a supplier's bestseller list.
Also in the Toy group