Puppy Collar Guide UK: When to Start and How to Introduce It

When should a puppy start wearing a collar, and what should the first one actually be? Most new owners get this backwards, buying a collar sized for the dog their puppy will become rather than the one sitting in front of them right now. Here's what UK guidance actually says, and how to introduce it without turning the whole thing into a fight.

When to introduce a puppy's first collar

Most puppies leave their breeder and come home at around eight weeks old, and it's common practice to introduce a collar from that point, though this specific age isn't tied to one official recommendation the way the vaccination timing below is, it's general practice rather than a single citable rule. What is clearly documented is the walk itself: Dogs Trust guidance is that a puppy typically can't go on their first walk until one to two weeks after completing their primary vaccination course, so there's usually a gap of several weeks where a puppy is at home, collar-wearing but not yet walking outside. That gap, not the first walk itself, is the right time to start.

By law, a dog in a public place in England and Wales must wear a collar with an identification tag showing the owner's name and address, a requirement PDSA's new puppy checklist lists as one of the essentials to have ready before your puppy arrives. Adding a postcode isn't a separate legal requirement, but it's standard practice and makes a lost dog far easier to reunite with its owner. Either way, this needs to be sorted well before that first walk, not scrambled together the morning of it.

What to actually buy for a first collar

The Kennel Club's own training guidance is specific on this point: buy a collar that fits your puppy now, not one you think they'll grow into. A collar sized for an adult dog will be too big, too heavy, and can feel intimidating on a puppy who's never worn one before. Look for something small and lightweight, and where possible, one with a clip-style fastening rather than a traditional buckle, since fumbling with a buckle is harder on a puppy who's already unsure about the whole experience.

This is worth knowing if you're browsing collars: most Bhooki flat collars use a plastic quick-release buckle rather than a traditional pin buckle, which matches this advice, though a puppy's own collar still needs its fit checked regularly rather than being bought to last a full year.

How to introduce it without a fuss

The Kennel Club's guidance here is straightforward: put the collar on, then immediately give a treat, so the puppy associates the collar with something good rather than something to fear. Don't put it on, take it off, then reward, that only teaches a puppy that having no collar on is what gets rewarded. Start with short sessions indoors and build up the length of time gradually, over days rather than in one sitting.

Dogs Trust guidance echoes this approach: introduce the collar and harness at a pace the puppy is comfortable with, breaking the process into small steps rather than expecting immediate acceptance. If a puppy is wearing a collar unsupervised indoors during this early stage, keep an eye on them in case it catches on furniture, a stair gate, or anything else they could get stuck on while exploring a new home.

When to size up

Puppies grow fast, often through two or three collar sizes in their first year. Once the introduction stage above is done and the collar is accepted without fuss, the actual resizing process, how to measure the neck and apply the two finger rule, is covered properly in our guide to measuring your dog for a collar, so it isn't repeated here. The short version: re-measure every few weeks rather than waiting until a collar visibly doesn't fit, since a puppy's neck can outgrow a collar faster than most new owners expect.

Collar or harness?

For general wear and identification, a well-fitted collar with an ID tag is what's legally required and what most puppies start with. PDSA specifically recommends walking a dog on a harness if they pull, to help prevent them hurting their neck, though a collar and tag are still a legal requirement even when a harness is used for walking. For most new puppies who aren't yet pulling hard on a lead, a properly introduced collar is the right starting point, with a harness something to reconsider later if pulling becomes a genuine problem during training.

Getting the first one right

A puppy's first collar doesn't need to be complicated. It needs to fit now rather than in six months, go on gradually with positive reinforcement rather than force, and carry a legally compliant tag before the first proper walk happens. Once your puppy is completely comfortable wearing one, our full range of handmade dog collars has sizes to grow into as they do, though as above, working out exactly when to size up is a job for the measuring guide, not this one.