The new dry food is probably to blame as changes in the diet can cause some substantial GI upsets. Because you're seeing both vomiting and diarrhea, I'll type out instructions below to use medication to calm his stomach and then a bland diet to help solidify the stool. Once this happens, wait a few days and then slowly switch Boozer back over to his regular diet using a 10% switch each day. That is, Day 1: 10% new food, 90% old. Day 2: 20% new food, 80% old and keep increasing the percentages each day until a complete switch is made. Keep an eye out for diarrhea during this time.
There are a few things that can be done at home to help make a pet with a stomach upset feel better. The first thing 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 buy the 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 using pureed baby food in chicken, turkey and similar flavors. Start small and give more as long as no vomiting is seen.
If this does not result in the improvements you’re wanting, it may be necessary to have your companion examined by a veterinarian and injectable medications for nausea administered. I’m particularly a big fan of Cerenia for vomiting as it tends to work quickly, does a great job and works for a full 24 hours.
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