請醫師幫我看一下這飼料的成分

bruce815 : 這是某牌的飼料成分,由於我家有一大白熊犬(14個月,公,已結扎,34公斤)有髖關節的問題,故給他吃這個飼料
另一隻大白熊(10個月,公,未結扎,48公斤)沒有髖關節的問題,但為了方便也吃同樣的飼料!!
但是問題來了,此飼料標榜可以控制體重並對關節比較好,可是吃了以後,有髖關節的那隻卻越來越胖,無髖關節的那隻卻變瘦了@@

所以想請醫師幫我看一下飼料的成分到底是什麼:

Ingredients:Dehydrated poultry meat,rice,maize,maize gluten,animal fats,barlcy,poultry liver,purified cellulose,beet pulp,vegetable oils (including borage oil),minerals,fish oil,hydrolysed crustaceans (source of glucosamine),fructo-oligo-saccharides,trace-elements(including chelated trace-elements),hydrolysed cartilage(source of chondroitin),taurine,sodium polyphosphate,L-carnitine,marigold extract(source of lutein),vitamins.

Average analysis:Protein:30.0%- Fat:13.0%- Ash:6.0%- Fibre:5.2%- Moisture:9.0%- Calcium:1.0%- Phosphorus:0.75%- Sodium:0.35%- Magnesium:0.09%.

Vitamins per kg:A:22000IU- D3:1500IU- E:600mg- C:300mg- B1:28mg.

Trace-elements per kg:Copper:34mg- Iron:175mg- Manganese:60mg- Zinc:250mg- Selenium:0.25mg.

Preservative:potassium sorbate-Anti-oxidants:BHA,propyl gallate.
Vitamin ievels guaranteed until best before date,as printed on back of bag. To be stored in a cool,dry place.

Feeding instructions:Serve the food dry.Always keep fresh water available.
Manufactured by ROYAL CANIN SA FRANCE
Imported into the United Kingdom by:CROWN PET FOODS LTD
25 Brympton Way,Yeovil,Somerset,BA20 2JB.

這飼料到底適不適合我家的狗吃呢……
請醫生幫幫忙,感激不盡!!

大敦寵物醫療中心院長戴更基醫生 : 無論哪一種飼料如何標榜，你都要控制牠的飲食量，不然都是一樣的‧要養到有點過瘦的感覺‧
這包飼料還蠻營養的，我還是建議您換大型犬幼犬飼料再另外買glucosamine.
胖瘦問題是和個體的嗜口性及吸收有關，不是問題‧