My year and a half old chihuahua mix is losing weight. About a year ago he was about 7 lbs and a couple ounces, and now he's about 6 lbs and 8 ounces. I noticed about a month and a half ago that his spine was protruding from his back, and started feeding him some bacon on a regular basis. He did not gain any weight from the "bacon" experiment. He would eat the bacon and his food. About three weeks ago, he went to stay with my mom temporarily. At this point he stopped eating his food, but would eat my mom's dog's food. And now, 3 weeks later-- he'll barely eat anything (including people food-- salami, bolognea), and when he does eat, he throws it up.
I took him to the vet a couple days ago, and apparently all of his tests (blood, heartworm, and fecal) all came back negative. The doctor gave him some wet food that he won't even entertain.
What could be wrong with my dog? Could he be depressed-- because he's living in a different environment? How do I get him to gain weight? What should I do?
Request an appetite stimulant and/or anti-nausea medication from your vet to try to get the appetite back while performing further diagnostic investigation.
There are a lot of causes for inappetance. Normal blood work has shown that your dog does not have some of the obvious problems, such as kidney, liver disease, or, diabetes, but there are many diseases that require more specialized blood work, such as Addison's disease, which is an endocrine disorder that causes weight loss despite adequate eating and in later stages, can cause inappetance.
Some congenital disorders can also cause eating disorders, as can food allergies. An X-Ray and ultrasound may help.
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