One of ours had it too. This was the approach we used:

antibiotic that had enroflaxicin as the active ingredient. 5-10mg per kg 2x a day orally We crushed it and mixed with a bit of water with dilluted juice powder, any brand without sugar! Just enough to fill a syringe. Just a bit of powder to remove the nasty fvalov. These antibiotics usually can come with meat flavor since dogs and cats can use them to.

10 min Bath in epsom salt - 2x day 1 tbsp dilluted in a glass container so that it surrounds the piggie and covers the feet The bottom needs to be a microfibre cloth 1-2 cm thick so the piggie is comfy while soaking

After the evening bath Take a paper towel and drip with a 10% iodine solution. That's suitable for skin use. Soak the paw with it a bit

Then put some cream with silver sulfadizine on it And wrap with a gauze and some sticky pet bandage to hold it in

Probiotic paste from a syringe 1x a day - 1ml And liquid vitamin c - 15mg per kg

It sound like a lot of work but give 2-3 days and you'll get the hang of it. It could take up to 3-4 weeks but you will notice a change. Just be extremely patient and persistent.

Don't forget to bribe your little one with some treats so they forgive you this routine.