Ok...About 3 weeks ago now I brought in a stray kitten that had a URI...The kitten is currently on Doxycyline...This past Friday another of my male cats was prescribed Clavamox twice a day...Now as frigging luck would have it I have another male cat that is showing some signs of a URI....Would it hurt to give him a dose of the other cats Clavamox? Or should I call and ask my vet?