“Why is my dog gaining weight when I feed them so little?” 5 Unexpected Causes Pet Parents Miss

Hello! I’m Dachshund Ansim, the Lead Researcher at the Magentalab Pet Research Institute! Today, a pet parent sent me a tearful question: “Researcher Ansim! My baby eats so little, but why do they keep gaining weight?”

While our furry friends look adorable with a little extra chubbiness, for long-spined dogs like me, obesity is a deadly enemy to our joints and spine. The food bowl is clearly only half full, so why does the scale keep going up? Today, grab a magnifying glass with me, Ansim, and let’s uncover these secrets one by one!

1. The Betrayal of Treats: The Invisible “Calorie Bomb”

A single tiny piece equals a whole bowl of kibble!

The most common thing dog owners tell me is, “I really only feed them a small amount of kibble.” However, many completely overlook the size and quantity of treats given outside of regular meals! The calories in a single dental chew or a piece of jerky we casually toss to them make up a massive portion of our dogs’ daily caloric needs relative to their body weight.

For example, giving one dental chew (about 80 kcal) to a 5kg (11 lb) small dog is the caloric equivalent of a 60kg (132 lb) adult human eating half a pizza all by themselves! A few training treats given with the thought of “this much should be fine” are often the main culprits pushing them well over their recommended daily calorie limit.

2. The Culprit Named Love: The Family’s “Smuggling” Scene!

“What’s the point of me holding back when everyone else is sneaking them food!”

Very often, the primary pet parent strictly manages the diet, but other family members are the real culprits. Honestly, not many family members can resist those sparkling, pleading puppy eyes staring up from under the dining table!

Dad slips a slice of apple, Mom shares a bite of sweet potato, a sibling hands over a biscuit… When the whole family’s love is gathered bite by bite, the dog ends up consuming calories equivalent to three or four times their regular kibble every single day. For a successful doggy diet, firm family solidarity and sharing strict feeding rules are absolutely essential!

3. Hormonal Changes After Spaying or Neutering

Basal metabolic rate drops dramatically!

After a spay or neuter surgery, the secretion of sex hormones stops, which causes the metabolic rate to decrease by about 20% to 25%. In other words, even if they eat the exact same amount as before, their bodies use much less energy, changing their constitution to one that easily stores fat.

On top of this, appetite actually tends to increase due to postoperative hormonal imbalances. Therefore, the smart approach is to reduce their kibble by 10% to 20% after the surgery or transition to a low-calorie weight management diet!

4. “Decreased Metabolism” – Scarier Than Lack of Exercise

It is not simply an issue of being less active.

When dogs gain weight, many pet parents think, “It’s because they aren’t getting enough exercise.” However, the role of exercise in a dog’s weight loss is surprisingly small. The truly critical cause is the “decline in metabolic capacity and muscle mass.”

Dogs living primarily indoors do not need to expend energy to regulate their body temperature. If their muscle mass also decreases, their basic “basal metabolic rate”—the energy burned just by breathing—drops significantly. Rather than making them run outside for an hour, stimulating their brain energy and maintaining muscle mass through indoor nose-work or mental puzzle games can be a much more efficient weight loss method!

5. Could They Be Sick? Potential Diseases to Suspect

Check for endocrine disorders!

If you are genuinely feeding a small amount of kibble and absolutely zero treats, yet your dog seems to gain weight just from drinking water, it could be a signal of an internal disease. The most representative examples are Hypothyroidism and Cushing’s Syndrome (Hyperadrenocorticism).

When thyroid hormones are deficient, the body’s metabolic functions paralyze, leading to lethargy and rapid weight gain. In the case of Cushing’s Syndrome, you will see a voracious appetite, a pot-bellied appearance (like a tadpole), along with polyuria and polydipsia (drinking excessive amounts of water and urinating frequently), and symmetrical alopecia (hair loss). If you notice severe lethargy or excessive water consumption alongside weight gain, you must visit a veterinary clinic without delay for a comprehensive examination!

Our dogs gaining weight is never because of a lack of love from you, pet parents. Rather, it might be a cute little mishap born from an overflow of love. But for the sake of our furry friends’ healthy senior years, how about we start re-evaluating their diets step by step starting today? I, Ansim, will always be cheering for the healthy steps of you and your dogs!