Imur: Speak with your veterinerian as to what they recommend for Billy and friend{s}. My cats have always lived indoors,and always done quite well on
dry food exclusively. Our vet recommends Hill's Science Diet dry,as being correct nutritionally for their needs. Dry food is better for their teeth too,
and helps keep down incidents of feline urinary tract blockages in boy cats. Also,is billy on a monthly heartworm preventive? If not,please consider it,even if Billy lives in,and especially if he ever goes out.