Hi Dennis,
Since we are approaching the winter solstice, we're entering the time of year when we experience Jue Yin excess, as well as the consequences of very low Liver Blood and Yin. Any of these could produce seizures.
You mention coughing of blood, not vomiting, but if you meant vomiting, then the formula to try is Qing Ying Tang, coupled with Wu Mei Wan (100g) to which 20g of Tian Ma, and 15g of Yi Mu Cao have been added. Give full doses of each twice daily. It should stop the vomiting and help the seizures subside. This combination should also help the skin a bit
To track progress, count the number of days in the seizure-free interval, and divide by the number of seizures seen when the interval breaks. If you see a decline in that number, you're getting somewhere.
If the dog truly has a respiratory condition, then you need to start with Xue Fu Zhu Yu Tang, which descends Blood and Qi downward, as well as decongests the lungs. You may want to add 20g of Dan Shen (Salvia) per 100g of XFZYT for extra calming effect. Continue use of the TMGTY
The TMGTY is fine as it is, but Di Tan Tang is drying and could make the three pathologies noted above worse. LDXGT (Snake and Dragon) is probably okay to use with the above, given that it has some Rehmannia and Dang Gui in it. Natural Path and Kan versions are a little safer when addressing Yin and Blood deficiency than other brands, as they have proportionately more tonics and so are less drying
Lastly, check your dosing. You need to give, on average at least twice the volume of tablets and teapills as you would granular extracts to get anything approaching to a similar effect. Many human herb companies have doses that are too low for small animal use
Hope that helps!
Steve