I wonder if anyone can help me. I have 2 bulldogs 3 & 1 1/2. 7 months ago the 3 yr. old started showing patches of hair loss on both sides of her sides. not read, not itchey, doesn't seem to bother her at all her hair all over became very thin. It has taken all this time for it to grow back in Vet said just feed her fish oil every day. two moths ago my other billy lost his hair on both sides same thing. The hair is starting to fill in but it will take another two months. I feed boyh dogs Royal Cain bolldog food. Both dogs are very healthy & the hair loss doesn't seem to make them sick. what is it and what can I do to prevent this again?