I would recommend that you plan a visit to your vet tomorrow.
The lumps you're seeing may well be benign fatty tumors that are common in older dogs. My concern is for her back. There's a condition in dogs, which tends to affect a lot of dachshunds, called IVDD or intervertebral disk disease. This can cause a wide variety of symptoms from tenderness to paralysis. Some dogs will show signs of abdominal issues though its truly their back that is hurting them. Because she's a senior and showing signs of being unwell, it's best to have her examined sooner than later.
I can also give you some steps to take at home to help your companion’s stomach feel better.
The first step is to administer a dose of regular pepcid (famotidine) every 12-24 hours. You will want to give 0.5mg/pound of body weight (a 10# ***** would receive 5mg, a 5# ***** would receive 2.5mg, etc). For this, you can visit any human pharmacy and buy the OTC brand name Pepcid, or you can use the cheaper, off-brand “famotidine” that’s available. Either will be useful.
2 hours following a dose of famotidine, the time needed for the medication to begin working, you can offer a bland diet. To make this, you’ll combine white or brown rice, boneless, skinless chicken breast and sufficient water for cooking in a stock pot. Boil on medium until it turns to mush and the breast is easily flaked. To avoid more nausea, start with small amounts to begin with and offer the amount every 2-4 hours. A few teaspoons to start is typically sufficient and you can work your way up every 2-4 hours in incremental increases until you’re sure no vomiting will be seen. If your companion requires a more palatable food, try adding in pureed baby food in chicken, turkey and similar flavors. Avoid those that contain onion or garlic in the ingredient panel.
More info on IVDD here, though keep in mind that she is not showing the more advanced signs, if this is what she has: http://sevneurology.com/articles/intervertebral-disk-disease-ivdd-in-dogs/
If she worsens overnight, definitely take her to the ER. Otherwise, tomorrow morning an exam with your vet should suffice.
I’ll be standing by if you have other questions. Let me know if I can help further.
Did my response help to answer all of the questions that you had? If questions remain, please reply and let me know how I can assist.
Before signing off today, please take the time to use the star rating system at the top of the page to leave a rating for me. Until this is done, the website will not compensate me for helping you.
If you would like to request me in the future for pet-related questions, you can do so by accessing this page: http://www.justanswer.com/pet/expert-pitrottmommy/?rpt=3800