Skin tells the whole story
Every other breed on the weight question comes with a disclaimer about fur. The Sphynx has none. What you see is the actual cat: fine wrinkles over a muscular body, large ears, a whippy tail, and skin with a warm, suede-like feel. That makes condition genuinely visible. A Sphynx in good shape has a waist you can see from above, a belly line that tucks upward behind the ribs in profile, neck and shoulders with clean lines, and a rib cage whose outline is faintly suggested under the skin without individual ribs sticking out. There is no fluff to blame and none to hide behind, so trust what the silhouette is telling you and confirm it with your hands.
The pear test and the pinch test
Stand back and view your Sphynx from behind and above as the cat walks away. A lean cat stays roughly the same width from shoulders to hips with a narrowing in the middle. An overweight Sphynx turns pear-shaped: narrow at the shoulders, swelling through the belly and hips, with the widest point carried low. Then use your fingers on the belly itself. Healthy loose skin and the breed's characteristic wrinkles pinch up thin and empty, and the moderate belly this breed often shows right after eating settles within hours. Stored fat pinches thick, feels filled and resilient, and the rounded profile is still there first thing in the morning before breakfast, which is the honest moment to judge.
A fast engine that still gains
Sphynx cats burn more energy than coated breeds because they are constantly spending it on staying warm, and they typically eat accordingly. Owners can take that famous metabolism as a standing excuse, but it has limits, and a warm home, constant access to food, and a sedentary routine will outfeed it. The gain pattern in this breed is often a slow rounding that the owner, who sees the cat naked every day, somehow notices last, because change that arrives gradually has no reveal moment. Monthly photographs taken from the same side and top angles, plus a monthly weight on the same scales, catch what daily familiarity edits out. Compare the pictures, not your memory of them.
Skin, folds and why extra weight matters here
Extra fat changes Sphynx skin management in ways coated breeds never face. Deeper folds at the neck, armpits and belly trap warmth and moisture against skin that already produces more oil because there is no fur to absorb it, and a heavier cat grooms those areas less thoroughly. If you are finding that bathing needs have climbed, that folds look irritated more often, or that your cat has stopped contorting to wash the lower belly and rear, read those as part of the weight picture rather than separate nuisances. Mention them at the vet visit alongside the weights and photos; in a hairless breed, skin condition and body condition are genuinely one conversation.
When this Sphynx needs the vet promptly
Book a body-condition check if the pear shape has settled in, if the rib outline has disappeared under padding, or if morning weights keep rising month to month. Contact the vet sooner if a rounded belly has appeared quickly, if appetite or thirst has changed sharply, if your cat seems breathless or unusually tired for this busy, clownish breed, or if skin folds become persistently sore, because rapid change in a cat whose body is this visible should never be waved away as simple greed. Bring the dated photos and weights so the vet can see the progression you have recorded. If a question comes up between checks, put a follow-up question to KinsLe's Kinny; he answers using the KinsLe Answers library.