Test the buckle only with the collar off
Press both release tabs and separate the buckle. Look inside for sand, dried mud, hair, or debris that could stop the prongs from reaching their seated position. Do not test a questionable closure by pulling on it while your dog is wearing the collar.
Clean debris without reshaping the buckle
Follow the collar maker's cleaning instructions and use a soft brush or rinse only if the materials allow it. Avoid filing plastic prongs or heating them to change their shape. Let the buckle dry fully before testing.
A damaged prong is not a cleaning problem
Check for cracks, whitening stress marks, a bent prong, loose stitching, and webbing that slips through the adjuster. If the buckle closes inconsistently or opens with light hand pressure after cleaning, use another sound collar.
Recheck fit after any collar change
A new collar should be snug enough that the dog cannot back out while still allowing comfortable breathing and movement. Recheck fit as coat thickness and body condition change, and use identification and walking restraint appropriate for your dog's situation.
When a product change is not the first step
Do not rely on a collar with a cracked or unreliable buckle near traffic or other escape hazards. Replace the collar or obtain the manufacturer's correct structural repair.
Product comparison note
What to compare if equipment may help
Choose a collar that fits the dog's neck, uses a buckle sized for the webbing, and has intact stitching. A buckle cover is not a substitute for a cracked structural buckle.
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