When Lady has been sick like the way you describe Tucker is, she will not take anything willingly. My vet was the one who suggested Pedialite and said to force it down her if necessary. I have one of those big Safety First Syringes I got in the infant section of Walmart or Target and use that to squirt it down her throat. If she keeps it down, I do it every 15 minutes, then alternatate with baby food on my finger. I stick it on the back of her tongue so she has to swallow it. Then, if all this stays down and she starts feeling better, I do the boiled chicken and rice diet for a few days.
I know how difficult it is to be at work when you furbaby is sick. I probably take as many sick days for Lady as I do myself! A suggestion for the future, could you leave Tucker at your vet's for the day if you can't stay home with him? I had that happen once when Lady had several seizures during the night, but I couldn't take the day off work to watch her. My vet kept her for the day for $25 vet board (regular board for a small dog is $17). A gave Lady her normal post-seizure Valium so they didn't have to treat her (but were authorized to do so in an emergency). It gave me much peace of mind to know that she wasn't alone and could be watched. Well worth the $25!