When is a Springer Spaniel fully grown?
Most Springer Spaniels reach roughly their adult height by around 12 months old, but they typically carry on filling out in muscle and chest depth for several months beyond that, so a springer spaniel who looks fully grown at a year may still change shape a little into their second year.
How growth typically progresses
Like most medium-sized breeds, a Springer Spaniel puppy grows fastest in their first six months, with height gain slowing noticeably after that even while weight and muscle continue to develop. By around 12 months, most Springer Spaniels are close to the height they will stay at for life, even though their overall build can keep changing.
The final stretch, from around a year to somewhere between 18 months and two years, is more about filling out than growing taller. A young adult Springer Spaniel often looks leaner and rangier than the more solid, muscled dog they will settle into, particularly around the chest and shoulders.
Why a weight chart is a guide, not a target
Weight charts and growth curves are useful for spotting a dog who has fallen well outside the expected pattern, but they describe averages across many dogs rather than a target for any individual one. Two healthy Springer Spaniels from different working and show lines can end up at noticeably different adult sizes, and both can be perfectly correct for that dog.
What matters more day to day is body condition rather than a number on a chart: whether you can feel your dog's ribs easily without them being visible, and whether they have a visible waist when viewed from above. If you are ever unsure whether your dog's growth or weight looks right, your vet can check their body condition properly at a routine visit.
Common questions
- At what age is a Springer Spaniel considered an adult?
- Most Springer Spaniels are treated as adults from around 12 to 18 months old, once their height has settled, even though some filling out in muscle and build can continue a little beyond that.
- How much should a fully grown Springer Spaniel weigh?
- Adult weight varies by individual, sex and line, and there is a genuine range within the breed rather than one correct number. Body condition — whether you can feel the ribs easily and see a waist — is a more useful check than aiming for a specific figure.
- Do Springer Spaniels keep growing after a year old?
- Most have reached close to their adult height by then, but many continue to fill out in chest and muscle for several more months. A young adult often looks a little leaner than the dog they eventually settle into.
- Should I change my Springer Spaniel's food as they reach adulthood?
- Puppy food is formulated differently from adult food to support growth, so most dogs move onto an adult formula once their growth has largely levelled off. Your vet can advise on the right timing for your individual dog if you are unsure.
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Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.