Good thing you caught him before it was too late! Check the Frog Forum - Toad Basics - Keeping ground-dwelling Toads. A care sheet for Bufo, Anaxyrus, Spea, Scaphiopus, Ollotis, Alytes, Pelobates for more info. A 1.5 gallon terrarium would be too small for a few weeks, he would do better in a plastic shoebox with paper towel substrate, water dish and hide. Make sure to check his foot for infection often and if it looks as if there is a problem, the Frog Forum - Basic Frog First Aid would help greatly, if you dont feel to sure about applying any antibiotics, its best to check with the moderators to see what to do. Good luck with your new friend!